Malicious PDF — malware analysis report

Static analysis result for SHA-256 17acbd700fca04d8…

MALICIOUS

PDF

67.8 KB Created: 2021-06-16 20:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2214753c9199935402615d3752abfc37 SHA-1: 26f3bf1de4fedb14226f2844116b6e8da82d114f SHA-256: 17acbd700fca04d8b6cbbd6a0131d9cc196d9e995574e2f7cc36dfa2017b3a56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of `utm_term` parameters suggests a phishing or spamming campaign aimed at driving traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=sai+ram+songs+in+tamil PDF link annotation
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/olr5iqem0sj79plji1uec6bg70/julatusupuvuvowotefazuxe.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/89223846113.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/gizesolosox.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/g41to0dko7q5ipe9jrp25eb2t6/gujojo.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b0941ea882a---37483362220.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b7ac6a1ad---tifipuve.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c662ab6fac9---falonawesepufaxuponevaj.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/nenadisunitazozibe.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/b1f759b337b42fee72c76f88e5d0f890/40699123065.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a9014ef6b---87771040267.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/po7j8vpvpc5gllu8dvchm5iq3t/87892497932.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf57e39576---42012764886.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/42023030116.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/wunazagogibibarabepirexa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93A 5108 bytes
SHA-256: a1edddb1d50a6f93b721a3b599202de63d551342a855853deb510fb37989d10b
font_01_sfnt_off0000da7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7B 12576 bytes
SHA-256: dca905a5f797c459107218e03df6166dccaa67c70824f15934c2057ec511e2d3

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