Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c419a0dbc8c62e7…

MALICIOUS

PDF

75.7 KB Created: 2021-09-18 00:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45c7acee3c8594638ce2155f9e717f56 SHA-1: f5b9778f17318f059c4f06d9f27a7064b3733ca3 SHA-256: 4c419a0dbc8c62e741bcf3b6ec67da8702744545b8f09572bedb149a56f85799
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a social engineering attack aiming to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://asr-net.ru/uploads/files/ruvegex.pdf In PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/mafimufokuzotorin.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161342aed83bcb---dovuturizolugonu.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/59299012049.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/4235116835.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/besibiribiminirujifawo.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/95296442087.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021941529504220.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/27779541046.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e129082c67---bupefitodotasitugenono.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/bexas.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/39692914571.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613749e16b7da---85601112127.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/fiziduxodofudemefiworive.pdfIn PDF document text
    • http://ropesadventure.com/d/files/39953890280.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbd6f1edfe---6761446254.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/60617053826.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/17844500379.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/12956087994.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/74444314691.pdfIn PDF document text
    • http://www.moyekolodin.com/files/62338778168.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161348d9719caf---lazonimujexu.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/71838285321.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/71181313506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=download+tune+me+pro+key+apkPDF 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_off0000bf16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72D 10684 bytes
SHA-256: 0189a353afe41121d8dd36430cbe57321a925c5e2229acb89e83a343ec3f482e
font_02_sfnt_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 18844 bytes
SHA-256: d4b0d728869a38c929c95fc38df3a51edac3ef87cf29cf161624737a452d73d2

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