Malicious PDF — malware analysis report

Static analysis result for SHA-256 663eff29592e5ce2…

MALICIOUS

PDF

105.5 KB Created: 2021-06-27 21:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 09583527bd8cf60045bb5658f48f0e01 SHA-1: 65b28db05b8412a8219c358fc526dd64e7c57b3f SHA-256: 663eff29592e5ce228ee754bfa15428e52bc8b65408395f2fa24174e49d77650
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the primary attack vector appears to be the extensive use of deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://philabc.ru/uplcv?utm_term=classical+theory+of+migration PDF link annotation
    • https://serka.com/serka/upload/files/gevubozod.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/69cfd1a1be4831fdfc301fea986fd7b2/26528566969.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/lufex.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/9fb12cf4f2e67083f04a3c9e2ead7048/duzovepowazatemamor.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0582176b4---95431844501.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/lopuvin.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/nixajovike.pdfIn PDF document text
    • http://rhondachem.com/d/files/63294677667.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/pijidixiratixidakum.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16226202889684.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/fb7efe9926f0d948ad0f0f322d32e67f/nojigabipegefage.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/38586270498.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b094d35c164---zomuwome.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/mebif.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/dccc84563acc184fcd9d931e363e3c16/9863140113.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/6073e1daaa5489bc86cb24a6226f7c5f/jumegenarixusemop.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/tuberojejuboditizeba.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/b661ba546f120004ed39717f7fc215a5/63810767037.pdfIn PDF document text
    • http://liyangah.com/Upload/file/kinexajewobiwubag.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5af0fc272c---fexezebi.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afb6d1dc19c---bagokagakipasuvekomoxore.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081abd494cb7---26227214675.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/7efb3b675450a7cf6d36fb1ccd2cd511/lifeb.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/99a55e2f6fcfdb8b3f0ebf0c8955b3f5/32713799260.pdfIn PDF document text
    • http://baybayankaauamo.com/clients/c/c9/c9e0f772d4a556598cfa564a27137582/File/7028056548.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/6nq6pvlc5k5vk8vpgc2vkfujl6/mugotimijamigituzobiviz.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_off00013a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A19 10928 bytes
SHA-256: 73acdac3cd5311c399836a04fc6f22a975c402f3223d70fe6c922bf457d6fd99
font_01_sfnt_off00015349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15349 17416 bytes
SHA-256: ba8bb3d85be5af85c76411b5055b43760b4e7c7e81916f943f89880eaba2a9b8
font_02_sfnt_off0001805b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1805B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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