Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc04fbefba4e9b3…

MALICIOUS

PDF

72.2 KB Created: 2021-09-01 08:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1400a0754e44a7292a572b214ce0e414 SHA-1: e817eaf60ed052f0bfc2b8d7a771ac01a1d12f65 SHA-256: 1fc04fbefba4e9b3703a1c3342e2c75d9b6995a16d1e8b7a9400a6ed52ff1c73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm pointing to compromised CMS uploads and disposable hosting, indicating a distribution or phishing attempt. The presence of a high ML score and ClamAV detection further supports its malicious nature. The document's content appears to be obfuscated or corrupted, preventing a detailed analysis of its specific payload or intent beyond link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/545b79e383c337a2ee7cc46cc20d4023/fepawanizokusa.pdf In PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/vogugesogetoko.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/97318568129.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/1djcrl6pe6naijlrb9c1qpnqj1/gemujudebin.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8b3ea31cc---dipebolurakitaxirokugasem.pdfIn PDF document text
    • https://atl-50.com/files/file/sopetomoxunuzajibevo.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/1d044fc76b048487f44316844311cc18/75759198861.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0vm9klrigeku9va0etq8dfetu6/rigutu.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e40486b158d---1508282387.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/vojumufubo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af7331b5d93---90044404840.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/878661ea7edc387b1cb5c5872cde5126/49835478179.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d1ea63a66aeed96d7d1b65cb19b6990b/4504003839.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/lazavujifaxifagebotonuma.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/67509710132.pdfIn PDF document text
    • http://koala-al.com/d/files/nikolofivepezavun.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902b575d521---lexemadejarafa.pdfIn PDF document text
    • http://internationalbeautypageants.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/91767456108.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/zogubuzapa.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/99370664511.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/86146537253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=download+game+shadow+fight+2+mod+titanPDF 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_off0000b949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB949 15900 bytes
SHA-256: 16e9f62e711ae6f338bd8c5c560a386f00d4b7841657c285e46799aa4885dd12
font_01_sfnt_off0000e1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 10908 bytes
SHA-256: b4697bf517218f066af4358adef81650ed531ff17465f6dd1a5b908f9164f7b3

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