Malicious PDF — malware analysis report

Static analysis result for SHA-256 deeaf3556765adbe…

MALICIOUS

PDF

91.8 KB Created: 2021-07-06 01:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7eeb9bd174e81d2f7d39eb0941c56633 SHA-1: 85efc8fff7f54d8823407bb121ee31436776dc8a SHA-256: deeaf3556765adbe7158c2941bda740a2beb9c82bd4600d6732bca89f642f43b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised CMS uploads. The embedded URLs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://duonglaohanoi.com/userfiles/file/dipofajasikutikugi.pdf In PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/61582071250.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/152b4c661abb0af7cffe17d5e96c1e2c/69789255549.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aebd7bccbca---46282328839.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099f61df08d7---88290683743.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/80kls7nr22s554n0p67411jd13/pulilopinavomozubijosurol.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/cf2e3031d33206249ef6b4dfb0d8beb6/mujirorofo.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/p8jeop0ofkgbrue1vsc7a20mp6/witafepakub.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/7670095143.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d7bf8a60c---5232273147.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/32124207130.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/40761920526.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/9699594889.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ceda365d3fe7d02e4457532500982291/99998278730.pdfIn PDF document text
    • https://vestol.bg/files/file/84701613966.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/27171540360.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/763ec9bc77f54d76ae3e9dba91807fe8/xulabadubaluxeravul.pdfIn PDF document text
    • https://mollis.rs//files/1947004892.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/mafubelupuxagefexis.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/98438852011.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/lakelul.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3069f52d46---47281657291.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/12362979607.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/s9bu9dmukeinlq2agjgo9q7ecj/bibikaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+gift+outright+themePDF 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_off000105ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EC 17300 bytes
SHA-256: 0d6c1b84352f50d2559f61873a113386d03517b607c570b4656be45d4a55a1e3
font_01_sfnt_off00013323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13323 10244 bytes
SHA-256: e3758216efe24047278c4482ae410cf9d37c1218245eb12bef0948185c5fa4a1
font_02_sfnt_off00014a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1