Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f114c58667cef0…

MALICIOUS

PDF

83.3 KB Created: 2021-07-15 16:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28a97e67730ea37202e5ccb4f9fc0a40 SHA-1: 11b4cb4b17372193f23c7aece0add9b9c1cc83c8 SHA-256: c0f114c58667cef0c333954274fed0a52fb18f73a5b0c1536b47ffe4c758c171
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the overall structure strongly suggest it is used for initial access via spearphishing, directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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=excel+consolidate+tabs PDF link annotation
    • http://diennuocdanang.com/uploads/image/files/tuvupisiwuvebowigex.pdfIn PDF document text
    • https://aashianarealty.com/file/80589453144.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/80171738613.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/vegenasuna.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/l671pt21r27c1jgstplqbfgs82/18311078960.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074a8c15059e---pufelurozomubudazezowiru.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afed6afc71---22326792988.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7078731a---bogikanilidobibisurirazu.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/6058793747.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/fewokedejadulonofok.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/bimasunomixulixogifenet.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/35780852914.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/342414758.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/70395429147.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/cd87aa64e5ee9a93f307fd6546416991/bedukitojopixusetavufiw.pdfIn PDF document text
    • http://cooleywestbrook.com/clients/865832/File/6904890775.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/66932091045.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8555d7f3a---xanubesa.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/konujopebujiwigatalad.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/16344527238.pdfIn PDF document text
    • https://nada70.org/userfiles/file/fabipudote.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/55985107319.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_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 10488 bytes
SHA-256: 16dd2e7aa25f36615bfbb92fb952aa354df2e735711b56e2f727e55485829122
font_01_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 17676 bytes
SHA-256: 8955472b752dfc79274bcd9f9a6e9c3a30b6d47858055984b80459256a2f1578
font_02_sfnt_off0001281f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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