Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a378e758e22854a…

MALICIOUS

PDF

93.5 KB Created: 2021-07-15 09:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1a7e864c9c4cddd2f3cddc200c00e214 SHA-1: 95358c6042a3ec6ae6caedc4043cc8bddb813716 SHA-256: 8a378e758e22854afa35ff1c69452e6ea9e76a2c669d6716d8bc06e23f3b439b
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly indicate a malicious intent via URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/rp6ml68dmcd0m5nqajoqomait1/duzibijasuwavojivuvigoxi.pdf In PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8eec2d8a8709f58e1fa1cdfa2a4e2432/15344806798.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/gemuvumepololofaz.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074c3e4419b9---46131665512.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d26c936de90---40461100895.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/4289c7573a4318ed4e526fbde30bf34e/bedusovo.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607774b8cbe4c---26413857971.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb74f1192ab---63797703907.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/hiktsfmivntdibolpreamm99ok/39746152410.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/2ff42d19a3d5d852a7aa2e02610196d9/runaf.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918e07706c8---fixodewinagikuvo.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/sipanofejevovep.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074996ea1805---fuvusibefij.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/rv705jkdlpc46dhpj0r3o7qgqm/kuzesosidojanutakonor.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/sekorixum.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608648d3d37b9---59518023094.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/dexofujetatediduj.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/86555085668.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/tafuni.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607038ffe02d0---98251856394.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/26aae67f1f34705f6c565b64f9bf6bf1/33252568671.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/1e641362f32b3ae4b8cfbc4f3959c737/tubulozurakugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=new+words+with+their+meaningPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000123b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B5 10712 bytes
SHA-256: b98777d037479751ba5e8ef200d96a365870ab883a74643404d2a65211ef0e50
font_02_sfnt_off00013bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF6 17316 bytes
SHA-256: f16920ba1343aa3423753bd700e6e3b2ccae96fed6cc0b24f1de96b9c83afa0f

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