Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b944f7a799d566…

MALICIOUS

PDF

118.7 KB Created: 2021-06-28 23:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 62adf769932ddb27116bb097bcfe0b37 SHA-1: 88d8360019d454ccefac8bbc8fd792298ac14e20 SHA-256: a6b944f7a799d5660d6560c805d515b61e1fc677f73d43f3e8d76f8b05e24222
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and link farms pointing to compromised WordPress uploads and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=2017+ultra+limited PDF link annotation
    • http://myucmas.com/userfiles/file/bajad.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607989503adf1---84402953105.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ef614b39a6437c6c4eee8be74a6bb22b/lonix.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/off6p2vlgmu6af157tt3078rir/87359853996.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa8b2ebe8---7809737628.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/6043d8fe48c672398e52baf5b74d4d90/neraxefiluwekido.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e8c0ad929---newabeno.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/550516c8ae9616423ef25333e51fe455/30849831513.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/vodigifigavizo.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/54892295743.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/61d020717ac1061254e647e0e50c7807/sanibuguduwakigadopow.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf71db8b6b---ruzowosatudiwunoweziretup.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a721546d462---japolesaxijumerapu.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/kixit.pdfIn PDF document text
    • http://clingac.es/d/files/20145710435.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30ccfec70c---36233152765.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/fatewesefil.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/94160922865.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd1e3b0490---46119491286.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/fupimivegadomivekuvuwuwe.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9aef5535f6---15468605213.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/53443174761.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609decb89fae7---31815418989.pdfIn PDF document text
    • 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_off00016d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D6C 10364 bytes
SHA-256: 6bea6d641e406603654bd9ec132984f585079700103746992938de785966fae5
font_01_sfnt_off000184f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184F8 18456 bytes
SHA-256: ee3f01f1feae6ae6ec17212277c0f08dcaf35db385a1fe8d94423ed05dea63f9
font_02_sfnt_off0001b5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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