Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8a5da12d95ef90…

MALICIOUS

PDF

88.7 KB Created: 2021-06-26 17:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 979267830f81edcd401682b508001851 SHA-1: a4fd6ef204d72a2afc61fe40533da26f66213ad7 SHA-256: 8b8a5da12d95ef90eaa3f66bd82514173cc00609a18d21ab91c5ce12df0420a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and disposable hosting sites, likely to download further payloads. The 'SE_INVOICE_LURE' heuristic suggests the document's content is designed to trick users into clicking these links by impersonating an invoice or payment request.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://skolicka.eu/foto/images/file/bapogofedijatagogidu.pdf In PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d2ae678dd---salazinamisanugigowip.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d011b4e995---ribagigibezezore.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/pigafosarika.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nlis6015qtupouesmpraajo3l2/pulamatamitu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/44b20cad13520ab5b9d543805614559d/kisexuzobedoraxadapomema.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/95599989901630618d06f96ea944c573/27477793953.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/2aae695c2cdc339e10f646877b12acbc/banewemenixigozagirowiw.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/4q5unntun3q60aoci8lsiot8p2/90016536961.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9a8a63313---kofinodenazexofazejan.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/83088359453.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b8ef7fcf5e6fa0344cbf944a6cfe643e/tewopadogimoboxo.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4176e74e4---rajiluxivakevufigev.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a14c5d89253---besigevazifiriza.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/kakanigajidijeji.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/75515384740.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ea5e8a982---13781517869.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/53304297493.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c5d1e05abfbf7a40915dfcaaf4387ac4/74429842182.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/wapubizurezakumajavawet.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/68895708240.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/rfsqg9599i63v4791i3b8i7jk3/fawiwadiv.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/jukf2uc016lbsairovai61a8t3/zobum.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wonadexevoli.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d40b5d24f0---kisasalejerixol.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/661807c03809f88c07df40078533854f/tuxoxebigatirikijul.pdfIn PDF document text
    • https://eternalbliss.net/file/jediverapitukenenibaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=relive+app+costPDF link annotation
    • 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_off0000f5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A3 10272 bytes
SHA-256: db08741f1f41d273ed01f6335e5c776797fa54f05d754a8de0e81594d7adbf5d
font_01_sfnt_off00010cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12502 17828 bytes
SHA-256: dfd7c08dfc378f2b8f4d837c08e07f770d9bb561406b9472aa510d6d26d0d280

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