Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bc37aded4b44a7…

MALICIOUS

PDF

68.6 KB Created: 2021-06-24 10:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 0bdf18686bd2581529b50250e9e221c5 SHA-1: e11b3c913b1d731df73bf726fd1faf404a96ab29 SHA-256: 86bc37aded4b44a7516524e4f6a5ce13b0dadf2f19a8b53b996dd709c5f56eee
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to online document conversion, likely a lure.

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://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/92ebb3be8c1921a73fc191010a654e16/70296039234.pdf In PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/72052396591f75651e18077bee27307c/82822172068.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/16a0408482d2035b76ceaa111c6e913c/6679058636.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/ubphq20tb16ovmlfsh3151ualt/29774309957.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/05ipr21q1tpob1j8veaemos8v0/teduvijaxo.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842f9ec7961---87460112544.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/q4cgf03hjqgl8mvg7nrt6m0ovi/37971509831.pdfIn PDF document text
    • http://beiks.info/public/file/908169714.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b42ee1db18---11495905733.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/12505911057.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/72b08299173892c8318aa30c3c8aaee3/4582444844.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/30572907863.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/47050782481.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/mepigabuloreriwid.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/lit8jhjhr7cdprnkhckngsbvlj/66441702394.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=convert+word+to+excel+sheet+onlinePDF link annotation
    • 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_off0000ce7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7D 4944 bytes
SHA-256: 9537409eddd39888efc58a25701e6e3119842c72d825cc3680463e0e24367075
font_01_sfnt_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 11268 bytes
SHA-256: edb77d3ef1eb59d7bd5077831acc8a948b63c3135ecc87d52f744d9b23f36d5e