Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ece05e3a0aa2f4…

MALICIOUS

PDF

86.5 KB Created: 2021-09-21 12:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 44aa731f1aee3d469fd1325fbd0af34d SHA-1: fd5c92aeee8dfc89f6b6e01d583b832e856972cd SHA-256: 81ece05e3a0aa2f491b2b9c4bdf187922e14c1ad9763f1d7455aadfb4f6a3824
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the presence of external links and the 'SE_LOLBIN_RUN_COMMAND' heuristic suggest an attempt to execute commands or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401da716eab---gulagi.pdf In PDF document text
    • http://praxis-greve-polley.de/web/editor/files/zopebusodererepifevivox.pdfIn PDF document text
    • https://menu2uplus.com/images/file/79264043977.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/lufatixusanatizebosi.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614521edafa41---neropokinisopo.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/97717626313.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/50824019606.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/kewidiludunarodogi.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/vediliwotem.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/e0cadd299dd00abaa5c34f9ea450bca9/bumilopuladawigifikexises.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/72021751122.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/sawab.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/27883573418.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kbg3bjmh3h1lbd1c5pe3o6sr60/15652093169.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/pufufoj.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/862dd6ec3b49363c6bc641ea7bde89c1/bujabumaledubasudowax.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/40627936397.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/zulabalatepexewuvi.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/dibefanifav.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/vawudos.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/mimekikav.pdfIn PDF document text
    • https://wholisticvibratIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=play+linux+games+on+androidPDF 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_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 10808 bytes
SHA-256: 8b421c96c4ba1d35e45ddccf3e924caefdbd70a6cbad43a2fee1ea102710d1ba
font_01_sfnt_off000105c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C4 18080 bytes
SHA-256: 25054a0d2d16650a0d5b159984e9d51deaedfd57db6c5449cdf99d124ac7f29b
font_02_sfnt_off00013430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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