Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50dd23913aea126…

MALICIOUS

PDF

102.8 KB Created: 2021-07-17 00:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6b7ce7721a3ef0e398db08d8c4b08383 SHA-1: 02d0916af6e99be7df4b320b99a1ccc39faccd44 SHA-256: c50dd23913aea126a502dfd299e18342d61ee466e38549366547fbc18e507a2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely to manipulate search engine results or lead users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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 http://zpb-maciejewski.pl/upload/fck/file/14671971115.pdf In PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce5ad2263---61279683032.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f2402170c---419295241.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/14357743318.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074a2e171935---8517638571.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/jixuwasegof.pdfIn PDF document text
    • https://seerupit.dk/assens/file/90025027016.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070f33019474---zunizituliditulofamovo.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ad73e60f39c---80964508337.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/28019416321.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb9ab95e30---nizepad.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/radugarupezusikabadebe.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/63351436395.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/gokevopur.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/h5gf92f2r7euuepao1lme9kl60/29479101280.pdfIn PDF document text
    • https://isosklo.cz/uploads/paxijadaj.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/3dsbanhrnoe29amtf44omkl603/56787730648.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/46fc66d3d4982dd3a8ccbbdbd2d979c1/98165046909.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/d8919b0db00202f1d65f642433ba4de3/nesirusaguwanota.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609daa4d767c9---32752781235.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d71457c5046---gepezasofonikutatubil.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1007c1eed8f8bdd7355c2c199affdf9f/50181723562.pdfIn PDF document text
    • http://nensi.si/upload/file/xajodiv.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/33652008545.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/739fa2f449711fcbee12e4a1888ea5eb/somilijagawotemor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+many+calories+in+double+sausage+and+egg+mcmuffin+mealPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00012905.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12905 17848 bytes
SHA-256: 6a5f285a3490ad6971b4b2ff7c21a0a761fe967d0efed3b691bf6e431a59cd4c
font_00_sfnt_off00010f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F30 11152 bytes
SHA-256: 2b88e935968d9bc010c091904e688d475046ff5faf0d32806e702c6b66b7fb39
font_02_sfnt_off0001448c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448C 18612 bytes
SHA-256: 8942c3767e8b201355b6e7980d7fd7e5c9e463b22ec3e1566517d14e8c92dd41
font_03_sfnt_off00017603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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