Malicious PDF — malware analysis report

Static analysis result for SHA-256 79dcb59c89fd0b4a…

MALICIOUS

PDF

91.2 KB Created: 2021-07-06 20:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 795b3d9ffc476f0528155f11d84a9308 SHA-1: 3bb00c1c3a46edfc6771a6d263aab9c61c02f136 SHA-256: 79dcb59c89fd0b4a8ede052c78376c4c505f3ad61c266a4793bcf4f7979812cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to trick users into downloading further malicious content. The presence of multiple unknown URLs associated with compromised CMS uploads reinforces this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5f41dbc0e---42284595074.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0d92d112ffafee856894c31a4967bc7d/67227680768.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608510c7907d1---notofuvi.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607abfa52a03b---69339332234.pdf
    • https://kawanmto.net/contents//files/lunijelirakunugaki.pdf
    • https://ctapigroup3.com/contents//files/mexamitevunomadesebewat.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092a17d594af---98016832695.pdf
    • http://aep-tc.com/cache/fck_files/file/zinafax.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9d3aeab017f66449dfcd3a821c4638a6/tixenujeru.pdf
    • http://hocikto.info/userfiles/file/74231811012.pdf
    • http://ed-web.cz/userfilesfile/62459359915.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/6171df1972aa4f7ac3a620dbb5ee68fd/66611796688.pdf
    • http://dinskayarealty.ru/media/file/jozekijemane.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/770cf367cd65920e28891871a5076d22/57435485638.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/46eacfde64a9806341b9926078ec0c14/kedapewegokoludejivamagek.pdf
    • https://marmarases.com/upload/ckfinder/files/73092269636.pdf
    • http://dioceseofniranam.org/userfiles/file/zabiminaxevudosanilasi.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d28c3eb0585---52913875154.pdf
    • https://profipreklady.cz/www/ckfinder/userfiles/files/genuduvakifusegiji.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bc44b9ebb---xaferemul.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcb316fa2f---rosopapuraleguwuvat.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607207ad7f86a---zanikamirizesapo.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/95d2e9ce527c2618bebc52a2df72c906/45165470984.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=male+muscle+growth+interactive+stories
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010518.bin
1171c27b4b6dd1c0e49cf1bca8f99d334005ea2251a6ea598b0a13c7778b6226
pdf-font-stream PDF embedded font (sfnt) at offset 0x10518 10920 bytes
font_01_sfnt_off00011e46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E46 16792 bytes
font_02_sfnt_off00013658.bin
8b54ba1f6afa1384d69729ba8a07ef69a6c0d8c633effaafc11fa392c8d29c7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13658 16076 bytes