Malicious PDF — malware analysis report

Static analysis result for SHA-256 a605600ac370880d…

MALICIOUS

PDF

75.8 KB Created: 2021-09-02 19:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8957585d450cacaaba9e886992c52928 SHA-1: f991af921741f48799cba93c28037dcf85b366a4 SHA-256: a605600ac370880df685ca4ceab23efe68f54522fb1225e3934738e010ae3fb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous external URLs that likely lead to malicious content or further infection stages. The presence of multiple compromised CMS upload links suggests a tactic to host malicious files on seemingly legitimate but compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://smidgel.ru/uplcv?utm_term=neo+orthodoxy+pdf PDF link annotation
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e0005c847---90606458466.pdfIn PDF document text
    • http://checopharma.com/upload/files/jilubapokevanebemiva.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ii40ifhit3ukrb4u4e86li6d06/25791041345.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e59df782600f96fcd75614184aeeb636/34397267473.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/4j1l5rbk5c79aicro6s5d923d0/76587851415.pdfIn PDF document text
    • http://texmet.pl/userimages/file/56564257890.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16106e23a72f5c---fufabewax.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bf493222c---68432729711.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/sojunetej.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/48de805770a55c112fe154e585f2d50f/7046081029.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c20c24e87---30602087579.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b24187ce8a2---wusujutilizarejuzipi.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/xogokoretapevosotamub.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/19087757597.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210804_4A2089C576DCC365.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/62146424285.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ak3md02dbiba0i647jhfj1410/watevadowotalunubaw.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ff01dbdd7---bojeletuzat.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/904ae4db564eb5bd386e217de7ecc3f7/12576565981.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fb060e128c7---zonur.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/befugujaludakuzufe.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/vafidejogosarukokonerow.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34d9ad0c16---41972373834.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_off0000c5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B8 17564 bytes
SHA-256: 1a92bfb5bde7d5ec549f7cb4f291473846f36072c0dab25ecfc704c9dc06be17
font_01_sfnt_off0000f31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B33 10216 bytes
SHA-256: 0f4e34bf7e2276014054a8a018f8cba581de151dc20509ed4960c4b230b38259

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