Malicious PDF — malware analysis report

Static analysis result for SHA-256 010b1f31bf03e997…

MALICIOUS

PDF

88.1 KB Created: 2021-08-20 08:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f31b0775d5fd650aecb6c86a13d4c615 SHA-1: 1b798a0f14f5439108856e4d491bbe6d76886aee SHA-256: 010b1f31bf03e99740d54cadf56e7f0286d6e27e742373d2d1200d3929a10075
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/e23c4b788615d772ed73b58e0f01e1f6/19096106050.pdf In PDF document text
    • https://kopari.hu/files/file/32257906757.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/4384f2bd11bbf97d0b0e3feb12ecfaa0/71067014856.pdfIn PDF document text
    • http://raczcsalad.hu/files/zuwul.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-27/20210627173011820174.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/33343943480.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9489c1df9114e0b2e15e21c9365ee82a/rilavotenu.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/vobikumavotavaji.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fbb1d581e9bb74cd8c1f038e826cbce0/42462474805.pdfIn PDF document text
    • http://ave-france.com/pics/files/25637618874.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/44426504997.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aea6e34d660---60788820787.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/358aea5e419ab288ba404ed182f81a93/lagetunusazexu.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/69492604652.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/damaruzetogixepurofoji.pdfIn PDF document text
    • http://dhf-china.com/d/files/jezoboxamewisivobe.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///bowonifizub.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/desuvud.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725df0d0ea4---fukefaruduva.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53f12e2871---refevezepijepesufolewof.pdfIn PDF document text
    • http://4bx.pl/public/file/58955389960.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc52892583---6172064492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=nobreak+apc+back-ups+rs+1500+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 10996 bytes
SHA-256: bda30fa20051b4e36ee31ad6b6b4505ff518592454677b2a5ca453c46e83fcf0
font_01_sfnt_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E81 3556 bytes
SHA-256: 38d1d2d39feee9efd2ba20192f322fdd9782733a6d293dbeee0c3391d2f61dd7
font_03_sfnt_off00011c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C56 20940 bytes
SHA-256: 36a3dda10f75addba87981386878fd27e6a2245781d6dcee877fcbd9e6f5cd84

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