Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbcf1bc559fec30…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 08:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7ee5c7753fc46bd277173a962b6fbec SHA-1: 78e7f43d77b75ff18b829f4a19dae7045a844211 SHA-256: bcbcf1bc559fec3019052bb000c7faf153c7c477e30d9d452de0c7239a1b94ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm or redirector to malicious content. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=ludismo+y+cartismo+pdf PDF link annotation
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e58ce8c212d7422e761ff98f9943b0e/91461739936.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/folirazekisu.pdfIn PDF document text
    • http://araonline.hu/uploads/file/99476192983.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9c01e880c---65536437742.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • https://museuminiaturesbesalu.com/files/votanupaxamotefaloda.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/18005171710.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/1b0d6e6d5dd9d83a451f2be03965d053/23314677007.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8fd4abe88c---90428194817.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/somuzir.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210706073125_t6uho3.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/qstqh094p1mjr6okd8vs7s13g4/wolunotawoxi.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/4536259233.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/pb50gp6f1p4fssu3rtkjfmtn66/pulotakudijer.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/tegapadobonopurola.pdfIn PDF document text
    • https://mo-space.space/web/img/podborky/files/9988290222.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3d2d2893---tevexaxumonizepizogexa.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/puzawu.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/sufiko.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d93a13827dc3183b82cacdee313b4fa6/nefoxu.pdfIn PDF document text
    • http://519pf.com/userfiles/files/fisesafukego.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/wezinizodotax.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/atbr4jgb70ad2obi01rtd2d53h/61993937543.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210820232239.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/46896118747.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_off0000e0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AB 16884 bytes
SHA-256: 37b201e05eaa6bf2dec7b0554de8c7dd29ea2aa282b559cdcda4be51ff300e61
font_01_sfnt_off00010c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0D 10672 bytes
SHA-256: a72b348de73740d5dac08aba6626f90a3cb4349b51b36b622aee71f131523a89
font_02_sfnt_off00012499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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