Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b1937eaaa95363…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 18:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 30c0173bbdd032b2e608851c78ecea12 SHA-1: 5b1cbb0e6e31ded3e274e09fbf4adff015286734 SHA-256: 62b1937eaaa953635de7868aa0935caea7d8c3f4f9ee6a78731a6cd264625f3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as a phishing trojan by ClamAV. Static analysis reveals numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links indicate an attempt to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3632

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://chcial.ru/uplcv?utm_term=obey+and+survive+gta PDF link annotation
    • https://zaragozadenoche.es/upload/files/14575541539.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2fb456c3b---38788775898.pdfIn PDF document text
    • https://kimansion.com/uploads/file/xedufobuvalofinesafisi.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/15327712649.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/5931835045.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/raloxeviwigafapu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/5qldga04m1c4t5f45004tmj3h2/96420053765.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cb29acdab---3185463983.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/13064711129.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/4844038632.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/24806900016.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/245c77f77368643692edd3cdceaceeb4/73633468192.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/vifipo.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/99281937645.pdfIn PDF document text
    • https://sainaudit.mn/File/3039566368.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/14351808720.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/64956243091.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/97780183205.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/59646246925.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/72354069669.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/viwanusot.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142c21d4c9d0---21046091576.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/73245992659.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12771 10704 bytes
SHA-256: 4d8cbf2d48fadb4f1f04fd74ef8f2ad0395ce8bff340025773e9014696387041

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