Malicious PDF — malware analysis report

Static analysis result for SHA-256 76dc83bb00c8a9dc…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 22:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b83d92044ece18826ad962aa9e833e6 SHA-1: 4a51c0eb1e8a5d2d3e79f403ae042507412439bc SHA-256: 76dc83bb00c8a9dc30f0095648ceb596c9ed63cf6d7659e04f6de49b013f3e71
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://x04ydivan.ru/userfiles/file/63520976780.pdf In PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/820af6a9ea40b2f4b1c9cc9993551bee/93858830472.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/dopixil.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5772972847.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/laju5g1uq43c3qkpu8l927gaq4/duxifomige.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/dofadojizivo.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aae4d45b1f---82253608178.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/48419529659.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/xibebojoguvunotedix.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e0461cc6b---gizarerepikawegiga.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/9jtdtqg63kl3trhuu7gcc67337/44279622902.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/toneruzikufak.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/rurenasesif.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e85275ab65---kadaxuguvutebifirufuxazi.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160943172a3948---72194515619.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/1s7k621amem34lqov4f25reh2m/74345422606.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/61839652716.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/11947308888.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210706_024008.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/sirixomefokexutukevuni.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc1539ab41---ziwofipeguwiluxomo.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/69907007322.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe4b0ad2db3---10921635833.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf50b9cd1---wuzadesepase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=data+flow+diagram+for+health+care+systemPDF 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_off0000d7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EC 11020 bytes
SHA-256: a5e310f95cc4b47fb20c56f4930154e6ba14ca9517d03d2e8250effe3d6dbc40
font_01_sfnt_off0000f16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 17800 bytes
SHA-256: 3ff5aa09fbd54735c60356673b10b7f6c6beceb5d2b202eece73f6f45838e457
font_02_sfnt_off00011ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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