Malicious PDF — malware analysis report

Static analysis result for SHA-256 df670b3c04bb8dd0…

MALICIOUS

PDF

240.6 KB Created: 2021-06-27 06:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3eacaa51c92312f0e0ad2354e7ea9bf0 SHA-1: 436a634bad5a2d1a20f1605622f586d6dd9120f2 SHA-256: df670b3c04bb8dd052c3bb7d070e45acc2e2509abf996c8e69b24c176fb0a876
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's used to distribute further malicious content or conduct phishing attacks. The presence of embedded URLs and the nature of the heuristic firings strongly suggest it acts as a lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • 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://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/1n6evecivo6plkac7mikdeap38/muzuniriwavanavolapunub.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/6777f4f0ba78e708baa8701ef2ad5dcc/rosuxo.pdf
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/38664220284.pdf
    • http://aire-limpio.com/img/editor/file/jepaw.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/eca967729fad162684a768d1c7128574/58494843910.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc00800c2---80325608444.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d838d7455---22078420567.pdf
    • http://chromoink.com/updates/file/84985803053.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/78d05da034efaa7f6bcf2a3c7d095c13/faditowelatodidupel.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607032b134519---wipasexipaluluv.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609ac0506a21f---48709963381.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d45b36d6e9---malobitixagiron.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff82cf57ae3a30daadf9a14bfc0ce430/87969816163.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/a25c609cdda5e6ea46a52db9bfae4233/xopaluda.pdf
    • http://www.cerathai.com/image/upload/File/bifexizapejimuzowawudomip.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840c95ede5e---83076609426.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078473e45a5d---9152769160.pdf
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/vajilomanijoripori.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b76fa635afa---tegubofeg.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc687f2ed3---343503858.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0eee8e99d0cb66978549b4fda6fd92ab/17013751017.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/dcd592a395051188111ec439261638bb/nuratokitirefo.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92e0f066edc020a1ab35855e14e18ee9/zusazibikabume.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=classical+cryptography+techniques
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000351fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x351FC 16792 bytes
font_01_sfnt_off00036a13.bin
3776772e4087df3b0637cfeb754d0ecaddda1aed4144028e341554a00bb82ac9
pdf-font-stream PDF embedded font (sfnt) at offset 0x36A13 11044 bytes
font_02_sfnt_off00038373.bin
240d43c406dfbb95ecb73490b2df80dcad6784cec13a25c73e19be5fb0430880
pdf-font-stream PDF embedded font (sfnt) at offset 0x38373 18356 bytes