Malicious PDF — malware analysis report

Static analysis result for SHA-256 4509f0db0730c84c…

MALICIOUS

PDF

131.8 KB Created: 2021-06-23 05:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 11a432f758fbf962b505ec62c384363e SHA-1: 2e0c541d0e45567772913e9d8ae0531948d1ecd3 SHA-256: 4509f0db0730c84cb021450dd18759dfe79055de0c17cd059f0640185d3a4d28
156 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 0.9998

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://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/q6npe5of49v8b44980dq322ud1/xuvesefajupekabapepix.pdf In PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b05b13538---xilekonopil.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b61deeefef---xarudojepisatejazofezibin.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/88f28cfc418f45b6dc38d4a88ba1cb80/vugumavuxena.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/36787687181.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0960b1e1b49212f985234e609753ee94/gizelonozasifukol.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091d05e89579---jubefusut.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/fejuzizavodaverunekaxofa.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/15964866928.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/20208256755.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/zujej.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16088522934e12---73918338963.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/48d4dc2c0b11871419b6a0df2854da4b/dimizaxebujetowog.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/868dd4af9b0702f6b055909488b1b163/jebiruboverabaritupedek.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/1a46b31b19199e0c5d4735fc0cffef1c/78023671607.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=precure+all+stars+new+stage+1PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In 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
font_00_sfnt_off00013e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E52 39704 bytes
SHA-256: 16cd8fe435acb9233ef24336e00ada62d48cb035fce001d7f522f1e198b5e281
font_01_sfnt_off0001b98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B98D 5112 bytes
SHA-256: 5c3f860733fdbd043c391d86bbe67292fae794ef601d087509971ea1169725af
font_02_sfnt_off0001cb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB17 11784 bytes
SHA-256: d57e4b2aed6a4fe6a05703a71b0efb98f505b546927507abf7f1f2022650af61
font_03_sfnt_off0001f1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F1E2 16308 bytes
SHA-256: 85afdcf12004a6dd10c03d7dd3c262ddaee20cab1ad746c93f8aa299df1354eb