Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d15c5912a57151…

MALICIOUS

PDF

71.8 KB Created: 2021-09-12 22:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 069ec2a8ced41419c5bff6aed23d5ebe SHA-1: 4b3cd6fb87234c8a83a94b65ebd79041d2854763 SHA-256: 93d15c5912a5715128d3a864b5e0e5e65d7181a446a4b6b5b624f8446f4697d1
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the presence of numerous links and the heuristic firings suggest a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://thementalhealthadvocates.org/files/userfiles/file/49665395855.pdf In PDF document text
    • https://amursvoidom.ru/media/files/gulotusakatosixitox.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/nijirolovavavidotaxedugaf.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/cefed94b6c3ff79840c33eab3deac47a/zanudumudap.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/74335375090.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e961d94ca---muvapun.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8858937e---81330159806.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/93960553978.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/81653080209.pdfIn PDF document text
    • https://cncunse.com/d/files/70320260786.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/88154714592.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/budulebubogo.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/19043906542.pdfIn PDF document text
    • https://ysh.my/userfiles/file/kifisuneni.pdfIn PDF document text
    • http://www.bandungmesin.com/file/59843616689.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/nilodarik.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/sonefutixotowexigawu.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/xojibitaku.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/arirk3d6nu15i51001mulo58d1/kiwufofexo.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/15068018913.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/54040097142.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/17955690158.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/zokoxiwaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=love+meter+frivPDF 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_off0000bb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2B 16040 bytes
SHA-256: a0753b3bf8736826b14b53f1a6201d072fa25a68992e3e9abc1ef9dbd53c3996
font_01_sfnt_off0000e3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 9916 bytes
SHA-256: 2093bf3efde6cc1bfbf8bc327fe238b7bd5fb313607ca94a5c73b3e44e39211c
font_02_sfnt_off0000f9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1