Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc80487d1977ac8…

MALICIOUS

PDF

74.7 KB Created: 2021-06-10 12:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ee1dcbbe8f4344c68965f356f479d78e SHA-1: 1f02181c354b5a7d3f35516c35e0dd0ce74c6e6d SHA-256: ccc80487d1977ac8164e04c94cb09a1f570f73366ed7ee160a44c902855ce26e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. Heuristics reveal a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with social engineering lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://huntic.ru/uplcv?utm_term=magnetic+ink+character+recognition+font+download PDF link annotation
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa209d3264---zazukasa.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/64040443877.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/vupipuziponosuv.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/rizar.pdfIn PDF document text
    • https://bamor.org/userfiles/file/visofivoribupokuzivolej.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bd0bf720b2f---kadafas.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609191c4ec7b6---bagaposuduzutuzere.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qc63rd3ibgru39bcei0hj4sgm5/tumepidaxuzanekomifek.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/32006533466.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file/%5C/86454035286.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3de6b9925e3c15639255e3d8ef61632/rafokonagarivajoliza.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16072c17b104fb---71262807599.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210606100212.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210527081806.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ba61a950642f98a4869dbea1777a52c9/66926837812.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2d6fc0491---73201602626.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad956a67f02---92458634036.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a387c9cf5bb---63119334085.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_off0000e4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DA 5268 bytes
SHA-256: 53b1d9c38c804d4e1beb1d79e66e39b02032afe7a59a3b414e95c2b2ac7db3a7
font_01_sfnt_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 11628 bytes
SHA-256: 23db3c39caac73d5259a5a8376f9f5a2cbbbf75cc81073abc59a123a2de2f0c4