Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f3e0a372a9d6b3…

MALICIOUS

PDF

66.6 KB Created: 2021-06-08 21:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e2237c82f4d6d7881a3b0e12a5096281 SHA-1: 6019efbb22165247a01de8f621404c0b08b53005 SHA-256: 83f3e0a372a9d6b3a509d8f975950dba68bb6b67d8691e538a0fe14a7f9c5410
154 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The document body, though heavily obfuscated, suggests a lure related to 'report card comments for special needs child'. The presence of multiple external links and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9038

Heuristics 5

  • 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
  • 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://oniceh.ru/uplcv?utm_term=report+card+comments+for+special+needs+child PDF link annotation
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/7fc6126ef389fe0a0301726e09d8345b/lifesawutesurawufiribumo.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbad049340---98071595221.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/9uqmmuosbfu2dmvhlphju984pc/89040419499.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ef6aaea3e---fobesexatodup.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a5cf39ee5---mozozexetilupekize.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/3a44e755fe080204b0c6a92f98d992d9/kunebuf.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/e80bb5ec2dd74f9543bb10bf4f792c7d/rifepupofuzavow.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/82016b46d2d4f9fc5e1825705906487b/24027539696.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750b8816605---pexuwo.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/jvr4q749n0bavrvbck3vh7edv6/mixixugosevepawojo.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/inrhrpetdntsf81ouiqg98286k/71351179323.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/31003079197.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8e26979dc61dabcc89ab39bae257c01b/71192890480.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 5192 bytes
SHA-256: fa4ca0bff7097f6d1a278cb42026cf0ffd646890aa8b999ee6d4925b3cc7b1f7

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