Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fa366ffa1b59b6…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 17:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 446318afe4c47bf8e0da77ff3610ed57 SHA-1: a97d6edd86c0b73349fb9c95fda1e888f2a57295 SHA-256: 54fa366ffa1b59b645f78ede8d5367d06f2f9910cef0ca2736850d1fe1ada00c
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress installations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The PDF structure and numerous external links are consistent with a malware distribution or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cb33c99d1---zewebo.pdf In PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/96070330236.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/tebenofebozonibakej.pdfIn PDF document text
    • http://salkim.com/userfiles/file/zumukapunifovejepedipi.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/77634560797.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b479206d4f1---wilibuwutexobu.pdfIn PDF document text
    • https://abeess.com/userfiles/file/jevojenozixipojemerex.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160f5acb9c2552---941046877.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4309d7a85---72387408925.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/55509409554.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/359580715.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/76939207944.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/761558e53299dd536a223aedea0000b4/jitanipowumanofo.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/daworixujexikomabiwesed.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/10cd9b22a477b6ff852d78aac350f821/67443661821.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/55231641925.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/87943228906.pdfIn PDF document text
    • http://myredm.ru/uploads/file/muvenoperesujotejosoko.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/55623458668.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/lidove.pdfIn PDF document text
    • http://clingac.com/d/files/lumupetijozigovazuba.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/82168fb60aa59458e08fc5833155e2e4/nepapubazenififoj.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/14029937300.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/35456790296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=common+skin+diseases+in+africa+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_off0000e57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57D 18348 bytes
SHA-256: 2f8f2d2a409d38e97b5f8bafdbc4b9e70ccff25ff380870862d8f643c460a322
font_01_sfnt_off00011509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11509 10760 bytes
SHA-256: a5a74acf496dd64db3492b832f3dffbd96896b7ff58860b7f82f9065f56624a5
font_02_sfnt_off00012dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1