Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6787e1639b70283…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 06:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f8e595c07d7592d2dd7c4234b08a701f SHA-1: 7fdf01d9909bfd83649511bdfb04af22d1c83f52 SHA-256: f6787e1639b702835a944aa23b1b07d6be385bc13fd3669a639222133de0bfd8
176 Risk Score

Malware Insights

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

The file is a PDF that contains a link farm pointing to other PDF files hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of multiple links to potentially malicious PDFs suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/14a91f99f1d2f12abcf8076aba36dfa5/regafi.pdf In PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a65ea889655---ketabebarax.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/mipatokuramalelub.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/xanakelepewelidowezerawu.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/xoziwekabupefuzusaba.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/81033650638.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/nudiwakitexumunom.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/98641943317.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/mumubito.pdfIn PDF document text
    • http://starlightcelebrates.com/clients/4/43/43e9139217482d7666ce300faf566241/File/dinidasawesaxobotadazaken.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/sagididel.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/37087421545.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/gawasexavajiwuza.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/51550328201.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/kemopakanududil.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rubozevaripa.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/titukoputul.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/43336060457.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/jewanonamukem.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/35466693839.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f59488f284f---70462454542.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a2d34afa---zifopilugozojezabe.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/74616039650.pdfIn PDF document text
    • http://kesifveotesi.com/files/ponov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=outlook+2010+crashes+when+opening+pdf+attachmentsPDF 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_off0000d3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D4 17800 bytes
SHA-256: 08b3e5e1e837494fed3d29921f753ffa75bbceacc9665bcab209796f20f02e5d
font_01_sfnt_off000101a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A6 11664 bytes
SHA-256: 336910aff91dc390263454c52c675edb1b1b21b0ca68415fe97311627d63ec39
font_02_sfnt_off00011d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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