Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c3bf2dc70fa2da…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 02:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 384f69a8bcf919fc4213f1dcc48e8e9b SHA-1: f54d5c18a55c7690fd66632801e793c12ffc45c8 SHA-256: b4c3bf2dc70fa2daf4b8023d663db628c68c1d05e117e0b653bd8b41ac920caa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 domains, many of which are hosted on compromised CMS uploads or disposable hosting. The embedded URLs suggest a lure for free software downloads, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://andlupa.com/userfiles/file/movimawi.pdf In PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e960487c---30673757296.pdfIn PDF document text
    • http://scro.ru/pic/file/45740862362.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/96fcb463da5cb7635e3eecf8597cc932/72194730226.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/gufib.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/6715af99e20c9c5e2381678bf84fa2a3/sirizuvoveworusejuro.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f967c4eb904cdd1ee31a95dfa67ed874/zudofipirurubigepuluweze.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/jcdt3fec67hk6ucqolomti7vd3/76291093634.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/98882471172.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/13960409628.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee1a2dc107---85989620488.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/jabogukapawimugifitono.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/jogugasebadinezaluwajo.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/63888190217.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c499f744d1b---kadasowosijorifebufolud.pdfIn PDF document text
    • https://digireg.pl/upload/tatirexunalosifu.pdfIn PDF document text
    • http://adice-area.com/pictures/files/jurokewetetifipu.pdfIn PDF document text
    • http://htwy.com/upload/file/70316420411.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/467997592.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/eiq2d7ovdbugm3nsju1mrfdlp5/fugofudi.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c5323340---depazobawisezum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=convert+pdf+to+word+free+download+software+for+windows+7PDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b200fb40bd4920d6d8d5472b49211904/zanuzizesuwifonop.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975025da18d---72728038963.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_off0000e6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F1 17496 bytes
SHA-256: 634d0f60cb3018a593da905b03462b1cc79ff643213458d3dde41aac8c72dd91
font_01_sfnt_off000113bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BC 10724 bytes
SHA-256: 141af05c135f627a035f3e14bd44a03657e2ad2a1af8b3922e6ef934d1f9515c
font_02_sfnt_off00012ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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