Malicious PDF — malware analysis report

Static analysis result for SHA-256 2105fe9ef6dc048c…

MALICIOUS

PDF

87.9 KB Created: 2021-08-12 19:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 3db140c8df7de3647e5fc24f6edb02f0 SHA-1: 202883d976228f5bf5ae3fdb18a240a3a1a1f723 SHA-256: 2105fe9ef6dc048c562b3adba61fd6a48899eba15d462cbfe382ef22786c84f5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of multiple PDF-specific heuristics related to URI and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=how+to+write+a+procedure+manual+sample PDF link annotation
    • https://homestayhoian.vn/uploads/image/files/felolatexotit.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4a4cd9d6e---89096784602.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/tevezusudevawomaroxivef.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/luxiwabafujesefejovapax.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/434379f9138aec0e01f93b147f23806d/ximebelixulobufutuvugo.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1623261844gerorew.pdfIn PDF document text
    • http://hncastlecable.com/d/files/gefopej.pdfIn PDF document text
    • http://digifast.cz/userfiles/duxinifaratigere.pdfIn PDF document text
    • http://vertinu.lt/ckfinder/userfiles/files/9484892818.pdfIn PDF document text
    • https://bojovicsirogojno.com//files/34223354485.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/78473987177.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/28251223505.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/bezezanefazeserawusabip.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23b9c8475f---57924455080.pdfIn PDF document text
    • http://epicridesnepal.com/files/17336570638.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/vivotovegumadebaje.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/kexaremigodudamexutenalo.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/lilanozedolaxot.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/405430233ba46bbf6516e8384967969d/44913838494.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/58fdc7317ed7cac50e0120ab768c78b0/xoletoriwarida.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160786072435d6---41418311688.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/vc702tk1kcdanorl5aq4g9fu3s/vuxonevopafasazuta.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_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 16120 bytes
SHA-256: 456b2d7032a2df7afa3b0abd436eef911d623c10d190e2a5e22115826c38cd7a
font_01_sfnt_off00011faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 10852 bytes
SHA-256: 7fede53933f8cad9fde6b51c813211d6bd611c4ff1feb6344ea99b24b7cdc175
font_02_sfnt_off000138be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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