Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba911609b1a2e4b…

MALICIOUS

PDF

73.4 KB Created: 2021-09-25 04:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30bd95f65c84d26a5fb7f3533649a67e SHA-1: 520ba8896b84ebf71739590288b6d8b1116121b8 SHA-256: fba911609b1a2e4b9d7ada0b6ff63377a3e6524542cc6d326511f80c6730aae3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://drafthe.ru/uplcv?utm_term=android+export+to+csv PDF link annotation
    • https://hongmao.tw/uploads/files/202109221504244473.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/tufedesixiwugebokolir.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/38116298767.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///mugorupujenun.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f00479c8b7---77286619269.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/16639311287.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/gowizege.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/89652120382.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/tekobepew.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/29283495941.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a41bd80e---65480889672.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/32101364912.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614bdf5ed01f1---fotatofivuwad.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210905031915.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/fosorerijadafunigolagab.pdfIn PDF document text
    • https://centrehistoriquesndbc.com/ckfinder/userfiles/files/83233343167.pdfIn PDF document text
    • http://erictex.com/ufiles/files/vewelejega.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/11900220859.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/19785961037.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/xezuzab.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/dadepesesi.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/37931805146.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/wumekuwowupepovisakometo.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/78820895033.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/figokekew.pdfIn PDF document text
    • http://agilesolutions.in/uploads/62834940809.pdfIn PDF document text
    • 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_off0000b6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AC 10448 bytes
SHA-256: 0922bb5e94f6550df1b0bf84da03fd716f4685fe8af74ddafa0888eac13cbc22
font_01_sfnt_off0000ce88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 19244 bytes
SHA-256: a73cc85cce66274bad70e22de0d296103c7697217fcedfeba3b521b0a6b1ed6a

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