Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe6f6d423ac8ca0…

MALICIOUS

PDF

79.4 KB Created: 2021-09-03 17:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 42931f5c99466d131b660ea8f85e545f SHA-1: 3ce78af5a633fd5fde7bae1f74527b019db61fa4 SHA-256: dbe6f6d423ac8ca0e25a3c173fd4300705f1e07cbfbaa8fc5e8c977e1ab46099
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or a distribution point for further malicious content. The presence of embedded URLs and the nature of the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=etica+e+competencia+terezinha+azeredo+rios+pdf PDF link annotation
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a472e65e426---kumetakinefogal.pdfIn PDF document text
    • http://vo23.ru/upload/file/10797775597.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/07/13/12087106124.pdfIn PDF document text
    • https://dcimx.com/files/sikirule.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/14d4a514cc23c01fe02d999aa99b3c5b/14217545961.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/2a5f8acad503a394be927c4f5ee49d62/wigufib.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92b400c0d4---goxibojavipidi.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/boxuvuxemi.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/28261379379.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/43305042655.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/6403416965.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/291498326.pdfIn PDF document text
    • http://sooclose.eu/upload/File/84298637136.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210813_232816.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/56028649274.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/39297883700.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/mumasitomigavoverifutuf.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e22443ea680---87176571287.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611aadb47948e---50023343988.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/be4e9f2996ceb57fac1fb19d9ddb1ac6/18912974302.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/428941330.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c23a762a24f---15205165374.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_off0000ca9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B1 20580 bytes
SHA-256: 5c91e674e64b05059c3d83e89981e2678ac0bff57e52080be6d0b8017f09bc7b
font_02_sfnt_off000116d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D7 10884 bytes
SHA-256: 5d62c4edfc42ccd83520d6ae62fcde08cac82bce06e847aac03ae0950ff6033f

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