Malicious PDF — malware analysis report

Static analysis result for SHA-256 490753b40aa5dfba…

MALICIOUS

PDF

84.6 KB Created: 2021-06-11 04:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: cb58479118679953075c045723fdacba SHA-1: 96804951a958786fcdb5d3000d7127e5f2e136e9 SHA-256: 490753b40aa5dfba277f27242e0b76a87f7fdfd7caaeeb0699f4b7862f98cb6c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9245

Heuristics 5

  • 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
  • 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://medvor.ru/uplcv?utm_term=allen+biology+handbook+pdf+free+download PDF link annotation
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6m350t26e940j91vbs1jop0881/tiwilif.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/eqekguktcgs7gg43sl379astsk/28372687813.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/306943e7c33bf898b3118d19d6e227b3/54170950930.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d70cb16f39---78722485260.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/ditulebodakisaxa.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/79516cb4c47649932917c33edfb8b30c/88977218429.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/95d497e5baecd5ce219c3f7202be6842.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/64621751589.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16090b65bb5ecf---saruzum.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/93608386948.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609620e8756d4---xirepinemimapojure.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6afepeiov02r1vs9j1apfbsnv3/lanasijanogibumadi.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/fa6q2fk58ro1p0u47vt3pd1bp6/ludixuni.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/vuramoduxufepega.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/zamobojujibapesenu.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001356a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1356A 9772 bytes
SHA-256: fa8047639a87ad77d724501085a9ce3b8887bfe240c34eb70a7632ed901734ee
font_00_sfnt_off0000e7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 5512 bytes
SHA-256: e1ab2279069518bc8cf260c4b2a4e1823a8ca90f8a9d2aefcb54bf15f821840f
font_01_sfnt_off0000faa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA4 10964 bytes
SHA-256: 856d96dddef0fdd849b59ba5873b1a413c0d9e89c16761ceafe44b3cd9d77044
font_02_sfnt_off00012000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12000 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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