Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02d3d1cd08de2da…

MALICIOUS

PDF

77.2 KB Created: 2021-07-08 18:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4dd90ec308a2d8ba95b8f4572eb54f13 SHA-1: f936b24d2290b5a3617ef0b1d64c3f9c021882c5 SHA-256: a02d3d1cd08de2daa5a1bf23e04ceb319a9ac6779a62ffd363e701bc3b940d3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://coretry.ru/uplcv?utm_term=the+biscuit+barkery PDF link annotation
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797c91d3987---55275888754.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d09253586be---40609435973.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac62b11047---19893047808.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed8fd6bc3---48912625768.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/160426ac3828e69c4bd1261bd69d68c9/milefovekilore.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/wuwaluzepizulejolejobisaj.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7151667e4---36047057294.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/17321646721.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/i93qtrsvfm1va83183c1b7lvig/31976967643.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/27200116688.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c1194647585b66e8741cb5ff239c9f68/85562784858.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97016878394.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/73514621171.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/11574018144.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/51795226893.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/74717930241.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/kakuwenufas.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a6fe46ed4f596a6e2d88521bf9ac945c/mugelikimofixozedojo.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/87659294411.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af837b91922---84507156986.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076cb9021cc0---tejawegejalonolo.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/4cafcdf66d44a9a5c35a395917cb182c/96052632134.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_off0000cb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB30 17200 bytes
SHA-256: b8f07723dc3e1b7e2da8ee5c3245eb3defdda73df678edeb24b700916bb47b98
font_01_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001100c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100C 10464 bytes
SHA-256: ab36773f350bf509968858de8e53b58fe9fbb942169ee29d838262acad496261

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