Malicious PDF — malware analysis report

Static analysis result for SHA-256 658c47cab270a022…

MALICIOUS

PDF

79.3 KB Created: 2021-06-08 20:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0de7d00bdf50545a133a815d8aa171d5 SHA-1: b3c047a35589fdeb27a165bd0fb99048f4f1e5cd SHA-256: 658c47cab270a022f627820aa271b6974eafec946e82b5c8f90b6b5cf0e4d5ac
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, designed to act as a link farm. The document body, though heavily obfuscated, appears to be a lure related to downloading MP3s, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://wastran.ru/uplcv?utm_term=tamil+songs+80s+download+mp3 PDF link annotation
    • http://phantasos.org/userfiles/file/3603499066.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/5633392013.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16072807f9e646---82190007338.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/99125134626.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9243a29be---nixugaj.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/d2a25248f560a7552da9dd4aa0e90e99/kiwokug.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe64ac830c---97362896127.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099e996a41f7---kitonuwodoguzuf.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075261f314d7---30887403452.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/677ef7f16572f7f265984b16aebc069f/dilukomubilavuse.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bee8bc676---taxixolifalotu.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/jedebune.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1bb158c56---bokuwogotolarer.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9c23c88847006d3c70b30536c307e9e3/57538566940.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b818da288d0---pigazasopi.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/juperewuzunofepurez.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/jetipolifilaweruborufi.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16076f49657504---goxiwamawu.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_off0000f75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75C 5724 bytes
SHA-256: 1fb97ea78197d2c60f430a2fe99ca87bc977c4b51c560ac04ccf3e0564c86ad0
font_01_sfnt_off00010ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD7 10888 bytes
SHA-256: 698d7ee4e49381298ef5a6d89bc8adb8dfd410e5d5be9e1446456a4b95c1d7c7