Malicious PDF — malware analysis report

Static analysis result for SHA-256 2942c6b6036e1914…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 17:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2dec36f31ad806d58bf8bf46bbc74763 SHA-1: ee426b13621e0508a4563f1717860bdbe6485673 SHA-256: 2942c6b6036e1914b9e56b93d8e67c71960cde443f5a0fdfc8f3d251af3da4f4
176 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. Several heuristics point to the PDF acting as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. One URL specifically uses a raw IP address, which is a common tactic for evading URL-based defenses. No scripts were extracted, but the PDF structure and embedded URIs suggest it's designed to redirect users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://cokhiminhhien.com/media/ftp/file/nopazamara.pdf In PDF document text
    • http://skogsformedling.se/bilder_umeny/File/tenasufevosusexuzoxas.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/fufizafixepogin.pdfIn PDF document text
    • http://brandine.com/images/file/ronitilusako.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/7715828079.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/57430800298.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e77a81a925f---1576456972.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/60920628151.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/13389768432.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d27410520---nokaretod.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609284fc6b867---82097512661.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/pilatedomis.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/mevisedojesax.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa244edd2c---pusibajodipel.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/82037343731.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/77d99a6721ecd705d6423ad9bc849ab8/9302395505.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/48201676227.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-5/20210705034741807674.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/3c2d2e46abb7f910bfe3684e2599343d/48836933847.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/f4cl0l8grrggrnsm9vj503sd6f/25763135262.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/pisaxo.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16075b935dc489---depijuvixixoxagowas.pdfPDF link annotation
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5764fb28c0---zijamiboz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=food+fortification+fssai+pdfPDF 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_off0000e2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 10412 bytes
SHA-256: ed7750c317f9d2ab7667ffbc57b0480ff6fd5c5d937219cb4211314e177e6a02
font_01_sfnt_off0000fa97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A9 17660 bytes
SHA-256: 5acda058f53a494bc5832f584cf959e6909620911948c6760d8b3ded2858e4e8

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