Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a27438a979eae92…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 01:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 95a71d1db38129bea27ec3b028c40182 SHA-1: 0a8838e1ac90e4086fda0368f7f84aaee58f7963 SHA-256: 5a27438a979eae9274b6644793e9a86ee4a2dec571e718ce933f27f22ade158d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d3281d4fff436d70002874369e892ae5/sigerarunix.pdf In PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/tidemuzelowevezazuxu.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b82f60fa71---48670442398.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/31328481132.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/wugetinom.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/8bneaecs7nkcp1jeho7e2onr1r/48794350373.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa1bb465f2---82310960956.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/niguvir.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/rorumaxetakopimonujifiro.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/3287451b7a1f4fe41698fae354e0e92f/vewasaledovijib.pdfIn PDF document text
    • https://computerzone.pk/file/zomorame.pdfIn PDF document text
    • http://petrduchek.com/files/kojiretebazesuzaw.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/59497790431.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/63029720412.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/46232806541.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/f861baf56f377eeaad99de94cb242046/gamove.pdfIn PDF document text
    • http://christopherdallo.com/file/jurerov.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cc0577b04e13e848cd721cacbda85895/13986980832.pdfIn PDF document text
    • http://rsst77.ru/upload/files/gutimituvegiba.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b5c37b2d39c5f3eeea3d971bce6d8841/74256763128.pdfIn PDF document text
    • https://parfumzone.ro/files/file/45659046873.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/99bd6978a188f1b4d3f85b64674e34ef/bowomozunodamedap.pdfIn PDF document text
    • http://kotolantopeni.cz/file/56251243462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=read+aloud+worksheets+for+kindergartenPDF 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_off0000e2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E7 18384 bytes
SHA-256: 99806c2c2a6ba8c4863552b2a12d4313ac8c9203edc223d45a942543d69ab367
font_01_sfnt_off00011244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11244 10956 bytes
SHA-256: 5ead9b2168a50994da87d2f9018ba285f3ea182f5b62d37ced98905547b4d37d
font_02_sfnt_off00012b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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