Malicious PDF — malware analysis report

Static analysis result for SHA-256 d938ebbeaf9e8d01…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 01:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02b7a95509fb91f8a53a42997ccadffc SHA-1: 0089a989dd3c841741fc625f818b16cb22af3ce2 SHA-256: d938ebbeaf9e8d01bc67e8d564a60b443db765c9569b0315440016194ee3fc98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm hosted on multiple domains, some of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of numerous links to PDF files on various domains suggests a phishing or social engineering attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://anhbanglaw.com/userfiles/file/19939688261.pdf In PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/64313775729.pdfIn PDF document text
    • https://majubesar.net/contents/files/86383964333.pdfIn PDF document text
    • http://charontrade.hu/data/file/guviziwofizoselijolabujos.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/33148979758.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/1874308178.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/liq5ktovnnimh32c12ph0pojc2/45710983447.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161377bb0944f3---22612763668.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ec2955efa---zikijajefoges.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/gakazurur.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/vudifezekesofexib.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16131e271890cc---folejomifukotibodatoriz.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/12135099090.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///ratuxe.pdfIn PDF document text
    • https://termofriz.rs/files/48277619824.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e0880efa9e4c6fed5c39296e548808ba/25332797975.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f184bd4b19---puzusajakas.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/limokidof.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/23486631013.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/pelufozelapavelafinin.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/79422410906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=flutter+install+without+android+studioPDF 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_off0000d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA4 18636 bytes
SHA-256: a7657284e1f6ecda0b319f963b2c32461806f92b1aedac3e483243ebdbb45018
font_02_sfnt_off00011e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E98 10508 bytes
SHA-256: 6802c4cb11a3077b743dce32bd10d56cbf21cc6ad54da6e5633560265b91ed5f

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