Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20cef8aace6571a…

MALICIOUS

PDF

100.6 KB Created: 2021-08-23 12:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a60ff810d77ec95cc861a2d1fbcf9f1 SHA-1: e52a3e42f2ad5163c4de8d0319b77cf167776050 SHA-256: c20cef8aace6571a4766c940b7d2d34f21001094145f9d00f96950bfc78e10fe
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a callback phishing lure. It contains numerous links to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or services. While no scripts were directly extracted, the PDF structure and heuristic firings strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://sarljarry.fr/userfiles/file/6385609385.pdf In PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31106196803.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/u8nv6mh2ovu0o3c02cgq08cqvb/wamebarubi.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/75298357883.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/uhm5c9vsfp4h74th4emh7h2t6s/xabizireperaj.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e8ade771c---legetad.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/75nguj7vt99c2r72hkuvdt5f45/53856660861.pdfIn PDF document text
    • https://banghenails.com/upload/file/89737807681.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609448a6d0e06---81777622108.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/f74567dd051484b9a75555a46f106c1c/judirodebudamujorerejes.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/30742561268.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/29987466385.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/28646744675.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db18001e483---dufatuxutanoloramevak.pdfIn PDF document text
    • https://ivanamihic.com//files/20216251863.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/nusebajegigu.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/60576985598.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69f15dda62---lawufebule.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed35e266f9---33136641179.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/24059671969.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/dotozalejenal.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/zegelixuji.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3c835568a---somemabifakakovebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+concierge+manualPDF 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_off00012614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12614 17700 bytes
SHA-256: 322c6ba0caac11311a7818d57c6211f2754687985183de4c9800b0de865096f9
font_01_sfnt_off0001547f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1547F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C96 10472 bytes
SHA-256: 3dcc3ffca6da9d8cdef72ba04552578b2418d2530ef7f26833729e87bbfdee29