Malicious PDF — malware analysis report

Static analysis result for SHA-256 3043dab9e3eb7d90…

MALICIOUS

PDF

78.6 KB Created: 2021-09-04 06:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3002d8b3df4301ca002939550725479e SHA-1: 4027db5b39c8e28d9743f81e4cf183bf06a2b1b5 SHA-256: 3043dab9e3eb7d90f817b996ceb2e407390c4e8b81c949b2cbe43d3c7628022e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://studiopiergentili.it/userfiles/files/pejagofog.pdf In PDF document text
    • http://boathousebrokerage.com/userfiles/file/67859032804.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/86016839050.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9f7e0712632c04f5083e56d404280bfe/retekibufasedanufesi.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608109c92b011---72868789206.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/velegulaxepeke.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/93212809265.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210828023602.pdfIn PDF document text
    • https://selltoob.in/ci/userfiles/files/43809059735.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/riserovugetofepaxaliko.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611d9140d5a39---lipiwewezobaru.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/153b0351d6f08c4fdd5eefd9b7b19614/suvizorumibuvafedaw.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/1dd883554db2057c8a64a40b37191e4a/busaboxin.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/29562836223.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01e1945d55---lubimi.pdfIn PDF document text
    • http://kasargod.net/uploads/file/76116485534.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/6402395288.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/27588060035.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/16697744234.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b0350c63a---76484899208.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/23162250382.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/87499173428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=anti+dumping+measures+pdfPDF 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_off0000ce10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE10 10756 bytes
SHA-256: 04ba60052259d0d037718ef77a53a596e83e309ca41888a7f5320c0c7f479512
font_01_sfnt_off0000e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAE 17916 bytes
SHA-256: 69dacff99149de461cf353636a67c39f87ecbd56d853b8ec61604672f098eefb

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