Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f56b6bc9a4be716…

MALICIOUS

PDF

67.7 KB Created: 2021-06-10 19:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a2e61a9bb9b1898396a0cce2f7df9c45 SHA-1: cd9a36d87a340640e4afca8dd3a96f6408f395b3 SHA-256: 8f56b6bc9a4be716ae0f50d2b268d1c8f746e915c165ba0d3437f55e9ae85d9e
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'cations and anions list pdf'. No scripts were extracted, but the presence of numerous external links points towards a phishing or malware distribution attempt.

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://smidgel.ru/uplcv?utm_term=cations+and+anions+list+pdf PDF link annotation
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/fbb5b39ff35c9fb72f2952d9441fbeab/59600060649.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/tofopurasolinofufotovimu.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/26786964569.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608e61928042f---naxixe.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/rutmmdf135vtqhtjnvemvb6mdi/46418030322.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/38052453863.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8017b05228---volabimokefunigedex.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/84659378823.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095eda2d5cff---nobujevolorage.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ec3c630951bd07c205e368de952ce6a/demusa.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/sigawupatoluvole.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719e5b1baeb---xivipepatesazusuten.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/43644831710.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/5fdedd2c8732077c430c5d1b281d2831/wedilapanonaribe.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb5434e553---47794499248.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/juzobeni.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_off0000ce25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE25 4844 bytes
SHA-256: f66a7df541789c5bf23e5a4ae692adcfd6037112d54ca8ed0ded0c1f557d0ebc
font_01_sfnt_off0000deb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 9848 bytes
SHA-256: 6724d24f19596d0a86b6f133f1e7f62d6982e61e4cc801578973d522d61da3cb

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