Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b889d244a9f010…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 07:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b097dc7168ebb3976148867fe1cd067a SHA-1: 8c14b81a7e9f9d73c12acad615e0b767a63e1c43 SHA-256: 84b889d244a9f01020e6548734a968bac235e0d4352429448476f0728ebc4eca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though not directly analyzed for specific actions, is commonly used in malicious PDFs to redirect users or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=civic+2012+manual+tabela+fipe PDF link annotation
    • http://bluecreator.biz/ckfinder/userfiles/files/gamekafeforaganevar.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e56efc34---liveginuxajedulimi.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/c19a89e75297067e5ebd9906f952bcf4/35871272099.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef1bea9547---75964028180.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/2nhj0cik48k7s3c81jjnu0mpfe/pepuzutozuvavinenibew.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/426c5958bcd0787f1f7852301047e88d/84206744404.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/5499602631.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161152e184d65b---64192704411.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/6g4bpummip63v9snisbojv1e67/99007023782.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/zidaxuleseruderabig.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/pasomotuguguremoro.pdfIn PDF document text
    • https://wineart.online/userfiles/file/91569912705.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/wamuzeg.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/5149309716.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2777a05d1---90132919318.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/magezimawefaxefatozaxage.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/pofozegademedumevuz.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/99383956567.pdfIn PDF document text
    • http://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/vovim.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/regovesevotube.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/12772a8121d0fad42272d7f183afedc1/komedukogozisinivemob.pdfIn PDF document text
    • http://ibb-online.ru/f/file/tapevopovejenavokez.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_off0000db05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB05 18056 bytes
SHA-256: 9a7108c10ed59176a12b53feaaceae981644f4df8c97f4249cfbe3e2b0907207
font_01_sfnt_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001228f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228F 10884 bytes
SHA-256: 96181c4f8e861b64b5fc858384694d24ed948ed2cd602799b9193422b1f7b99b

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