Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acb2eb1aeaeac49…

MALICIOUS

PDF

71.5 KB Created: 2021-06-16 00:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 945edf5978e0232e9338cc0fbc9c27bf SHA-1: f647ec7f1644dc32c5419e47d17fb47856418d70 SHA-256: 3acb2eb1aeaeac49a3522911adf4185491263ddd1b1aa6eb5aba50492297eda7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous links to external websites, many hosted on compromised WordPress instances or disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains a reference to 'Frozen songs download mp3', likely a lure to direct users to malicious sites for malware distribution or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://chcial.ru/uplcv?utm_term=frozen+songs+download+mp3 PDF link annotation
    • http://freeski.hu/freeski/file/rarudimuwo.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/c4a82ec8770793cc2000c6a4ca1f8928/norumof.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ab8a7c1ea---gopakoxaw.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/63pvevga0t1hisd19tmtu12uta/20487511601.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/p8avkmrtreu467thuamfefvf7t/79478091336.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7dfd008e0318ca4fcfc81578f7a884cf/99392234846.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/43801653533.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/jogamabov.pdfIn PDF document text
    • http://zuche0551.com/upload/file/benesoforisaw.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b434f8616a---lemudugakogeroxarulo.pdfIn PDF document text
    • https://maturana.cl/upload/file/92953490880.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/98081683865.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/87851236494.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/fcd1c9cb1b84d723bb7b009d6f317269/pakubazebabajikugelusixi.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160976d43bef9f---64582023338.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_off0000da07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 5540 bytes
SHA-256: 77ff237721f83010e8995fab3e947a0ad1ffe037d3ba0f644bf1d70d144b4345
font_01_sfnt_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 10716 bytes
SHA-256: e424e54e3d101429773b808dcd1456e7c08dfa8f9e01840f711abb0d679fb961

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