Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a308e2ce5c5e04…

MALICIOUS

PDF

79.0 KB Created: 2021-09-14 07:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5bf10184b3efbde7a347f33a71d49bb SHA-1: c635260a754b86c64c8e45ba38adedff0d2f27f2 SHA-256: 25a308e2ce5c5e04397e209b4f069b1537cac2561bb5e884feb5247fbe77505a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The document body is unreadable, but the heuristics strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://tonerihned.cz/userfiles/file/jutovanizubigudud.pdf In PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/6424844670.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/hgctppplkkf0ltrs7vp9k8b2hd/galorurokebifelemi.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/fedusasogamipirakijebo.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/padupo.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/xosinobojumodeta.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613991fd9f6a7---vagozasevonijafar.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/kixulivisevorabodi.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/kifemaredefaminawija.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/clk5h805nqbq5ds89mt0t96s56/42424218575.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/24250026626.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/meforuxonubetojosoperi.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/46749543694.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/36005586436.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/cddcabd2b14349db55c5e38fcd82dbc4/43503366417.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///tefolowizetifuf.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/gugixor.pdfIn PDF document text
    • http://namngonviet.com/user-/files/48383752675.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/48047738232.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/pupizimukesijitotewi.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/4efccfd96cb6d30d0a98dd5ebcbb8222/bakofazunoja.pdfIn PDF document text
    • http://chinazzjx.com/d/files/65882432888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=legacy+of+goku+romPDF 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_off0000d0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F6 17612 bytes
SHA-256: a9595c1cf8f165190e7f2e1b862a942f7ac39d5a7efab55676ee8cc99a12d930
font_01_sfnt_off0000ff43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001175a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175A 10436 bytes
SHA-256: 0aaa02c2db6eac665a0b103706028a4bd6cc65347c372ff49f7389aa0edfd60c

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