Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1a4e98eadeded5…

MALICIOUS

PDF

81.4 KB Created: 2021-08-19 10:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b1237c6b030cd1810385a06ee435e678 SHA-1: 9a32bacd478c4519d1c22503b3392552f370ef86 SHA-256: 6c1a4e98eadeded5aee4d67bbccf1ddbceec82b2edab1c9f1dfafce5007b4f68
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing attempt impersonating Netflix. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to trick users into visiting malicious sites, likely for credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=5th+grade+persuasive+writing+samples.
  • 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://adams-gold.ru/archive/image/file/dunuwuxalo.pdf In PDF document text
    • http://www.lnk-creation.fr/upload/file/58221065494.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/84fdc7395b418863c288b17bfab7a394/32213605664.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/01obicfnid444ort1tonu4apd3/kisirenujokezil.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/buvibupebofavuzuxazoku.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5dd4d74a6---sudoxok.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/f36bd3da75047ce24c4debd2618d5628/14043913478.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/lifes.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3f2255bad---jirixor.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/31742319325.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210812125602.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/1637384851.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/80566211253.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0b7fbcd80---nuburowomibelasugulu.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16091f6c9df9b0---mevodu.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/22869030339.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/38210794647.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/i27i48icermlcknvd67ude2eq4/xawozujatawinad.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/dvd6c3ir20cm0fj9kv27l2fmat/36070854712.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/6e6td690g3a4i49dp4b7o9r6ub/9322499931.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/84086025698.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/fuavls7i6ud6bneckdq6bicol2/zijitinafavepevabuxoto.pdfIn PDF document text
    • http://webursitet.org/Files/file/9660560918.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecacb27bea---11553206390.pdfIn PDF document text
    • http://iccarrentals.com/files/file/levisizegem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=5th+grade+persuasive+writing+samplesPDF 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_off0000dc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC38 16464 bytes
SHA-256: b3e2a3315fae233457eecc0b697413721919783efbbee36d7ad28e77943829c0
font_01_sfnt_off00010631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10631 11008 bytes
SHA-256: 072a65e405f404efb05e0450caa5d955ae40a4c19c473240ca9fdb099d1f5100
font_02_sfnt_off00011f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1