Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3c40abd1422665…

MALICIOUS

PDF

78.7 KB Created: 2021-09-07 01:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d79b8f267ce235eaa4bd195438c2a41b SHA-1: 7ce699daf926b28ddabb03d97193e7ec70d99901 SHA-256: ac3c40abd14226657b6931e62b83a83905a3a8fa1e23c8a5bfbe1c37bf876e31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=symbols+in+english+pdf PDF link annotation
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/xujovinaxivuxoj.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/bomagusef.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/76588219642.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/lebobasemowumufakas.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/81492895913.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/17052676342.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607943908c4ff---tirekagokefenopeditositu.pdfIn PDF document text
    • http://renovator.cz/files/file/6399018327.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/86021403613.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe19a01bd73---70618542992.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/najovesikajawisidixofot.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/53209758126.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3b981095daf63cad2726065a0f386a48/37094810621.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085cddbd0e97---bipumugez.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210731_3E875130FE80493D.pdfIn PDF document text
    • http://imoroz.by/upload/file/27268660255.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/176067472.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d43400b2b5d93d012dde02f58eb975bc/79529708753.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/ribexemesarapobivoxujulem.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/6b6b02ec30a2daa396f51d4c89dde8ab/fopelazadulifodulixok.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/98e6054219e11b5e6f6fa4e3499ae16f/94575503464.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/31836921552.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/pimapedojujabasilug.pdfIn PDF document text
    • 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_off0000c209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC209 22024 bytes
SHA-256: 34af80c1b9f657aab4aa51816c23bb100529f77b7fbbc3c2b609973f9e079a18
font_01_sfnt_off0000fc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 10912 bytes
SHA-256: ef642eb9fb17c1c5605995fd25822b9bc308de28fd048247382526544c80a398

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