Malicious PDF — malware analysis report

Static analysis result for SHA-256 854a02aca664a0ad…

MALICIOUS

PDF

76.9 KB Created: 2021-09-02 09:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64f3b00017b452b56086dd733bf0546b SHA-1: fb9f7f8fce1f18ef387c8695568a07a7a9f75b13 SHA-256: 854a02aca664a0adeb0cc98a63107fcbd655ce68457ffdf37b645eedd8652831
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm to direct users to malicious content. No scripts were extracted, but the presence of multiple external URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the intent is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=masking+agents+in+sport PDF link annotation
    • http://krevue.cz/UserFiles/File/98706068166.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/2dca4ef54c9ccff9ea8174a5e754ea89/nugusosonedolimetosodupe.pdfIn PDF document text
    • http://mosjob.ru/images/file/79868395316.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/17289636837.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773cb112f5c---63658766733.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c11aa1f2238---93883063171.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/88097013930.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/xaludenadubifiwajegukif.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8837b79a8---35047326340.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083986d6679d---fikadewafeb.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/zewuwexozozojebafu.pdfIn PDF document text
    • http://atya.eu/files/file/29539169377.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608045562abda---80563057919.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/32404635796.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/mopemizaz.pdfIn PDF document text
    • http://usateatop.com/_upload/files/bitoreku.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/23566764316.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/8779181439.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/j93f345mn0t3jcor8g4672kv49/lukovoti.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/12267040263.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080a3688db4c---12389739561.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/15155462491.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/dakadopexovugi.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/jexetipoxipaga.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_off0000ca14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA14 17132 bytes
SHA-256: 027310c56a74b70c42d4713ec0934c97d7b443203406626c8cd6540f2e7d4c7b
font_01_sfnt_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 10468 bytes
SHA-256: 4885c53be5804ff6a48d6b0fbc14eba2517cc632bd92e96358b61ab620fab4f7
font_02_sfnt_off00010e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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