Malicious PDF — malware analysis report

Static analysis result for SHA-256 6032ef58328683f0…

MALICIOUS

PDF

72.6 KB Created: 2021-09-07 08:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe530c77d485a7151120b0cdaf658006 SHA-1: 6cb5bcc278b44aa17f086ea5bd05f82994da2327 SHA-256: 6032ef58328683f0dbe1aa6141c1240a7c173202269483f11b36009b4069553a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on distinct, potentially disposable hosts, often with UTM parameters, suggesting an attempt to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=prince+pvc+pipe+price+list+2018+pdf PDF link annotation
    • http://kielcenoca.pl/files/file/76928222728.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/92470596165.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/45215984973.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ca90c40f4e3c3b30c6a7b482a1a923c5/fobajagazurigusetaj.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8f6c273bfd1344c857dfaa2d69ef0bd/gipotebebunudufuvof.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ce5ca72ec---vozejanamibemu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607580759d859---48933835558.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/dajewikoz.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/daselugokubu.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/11122303527.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/85524821231.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ets3c1caje28o4q1056qhjenk7/gemebagawajatimegiziku.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a551dd6d6e2---53512621158.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/131593331.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/vuzeka.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/v04373rcn9mmp73098pj24nhno/lukejolawinebusenejojo.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/50868961647.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/49826311968.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/gupogaporubutise.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/gitarikekadafimag.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/97610524722.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/6349848684.pdfIn PDF document text
    • http://herve-coiffure.ci/files/68828164114.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_off0000bb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5F 10900 bytes
SHA-256: 69fc678fe1ca581fbd65256754912fe4b57f25809f697970198859469eb8ca95
font_01_sfnt_off0000d4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 15836 bytes
SHA-256: d42047d280e00be91661d9618e2caa1a82a4d991099bbd76f02ad471e13e83fa

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