Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cbd58b64b2d6c09…

MALICIOUS

PDF

86.6 KB Created: 2021-08-01 16:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df7d4e8762b6843172f69513083d69f4 SHA-1: f4995b02542e690ada8f6d2cba4b6b91987d8454 SHA-256: 3cbd58b64b2d6c09778acce7e91ccdfc8bef21a9b8cccf7d3530880a949cbd3f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress installations and disposable hosting, suggesting a link farm or SEO poisoning tactic. One high-priority URL, http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5a93030b6---tifixopipubatojapapin.pdf, is specifically flagged as a PDF random URL link. The document body is unreadable, but the heuristics indicate a pattern of distributing malicious content via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e35fdaf77e8f885002a86d70c5254ff8/26700762154.pdf In PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/9599059348.pdfIn PDF document text
    • https://ikima.fr/uploads/file/89660411239.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/su7hrh0tpo0o7u8e3o62dt635u/23524030645.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b067de67a01---36529842320.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/qmqu833r23h123us2lc5vt938d/87554064238.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5a93030b6---tifixopipubatojapapin.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce11ef1b63d---33342991230.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/14804555714.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a7e1ec349dbe6e853fe9042bdf9e6eda/70705668043.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/859fa634ecee5cd53c0efa212a3b616f/funigewuz.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/84532859200.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/dajemewepakato.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3df5eef76---gikuborotubaw.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1cae7b2b2---kopibiboxiworopi.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/e1d58749bdb21466e0c360bb05ef8133/saxenesumubukigej.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71746c8b74---tikiwomarefidufide.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/67029264752.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa2a085cea---tonifomatenejub.pdfIn PDF document text
    • https://plasy.com/uploads/file/78051095729.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ho157kn819sm2b6h42knrmvi92/45602572963.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/veritogu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160c609286a7c7---90812834906.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/c6eit08lomnoa09q09eedde0h3/73304673145.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/52897801080.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1be6ab3eeb5d103081f9b53286129616/xegotutovagosebafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=grigori+grabovoi+numbers+for+successful+businessPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 17468 bytes
SHA-256: cc40a3914d2b1e72f215e8fe3c3162ca6466ca97425c6046a3aae3bd764b96fe
font_02_sfnt_off0001300a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300A 10928 bytes
SHA-256: 1923b93c9c2f8e58ab52ad211ef3b9770ef101e549059e3a3da4a48e6a424e7d

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