Malicious PDF — malware analysis report

Static analysis result for SHA-256 72fd13fe76351e1b…

MALICIOUS

PDF

89.2 KB Created: 2021-06-29 01:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c70cbead850e86ca42617f193fd1e9da SHA-1: 18d9db26350be727f7becc0a0ff5bab99b168203 SHA-256: 72fd13fe76351e1b70e1087081064e2e74433440fe566589dce6aa6d87dfaaee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised websites, likely to lure users into downloading further malicious content or divulging sensitive information. The presence of multiple links on potentially compromised CMS upload storage suggests a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/2123aa1bceec22fca6ff04563dc9002a/bivan.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/894cc165b42c2192576bea753d8e109e/37519745872.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b595389c92c---66176159603.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vn29utff8adbqgjmpclfqkvqq4/83582571119.pdf
    • http://goldartline.ua/userfiles/file/87907115669.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/a1f8b63c6982620da8d7981669145f8a/makedaj.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcd7172d45---40134778019.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0df22732a2ce0332800207ff9c7a56bf/xunisawazilejo.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0ba0bffd---gefub.pdf
    • http://candientuvibra.com/images/file/21741875457.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3259c83b6---88449485408.pdf
    • http://hyosangjo.com/userfiles/file/20210627024947.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f30e5813cca30287de975edcb01d2d1a/15261292078.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9176f754d5---bejar.pdf
    • http://loveperfectionschool.com/upload/file/metadogap.pdf
    • http://asremajazi.com/uploads/files/fedajuwoxabesobew.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bcce66813cc---fijivedosijo.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/8a4p4sq1k140ijpg2cor6b4nm6/nefiveweganu.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/eaafbd7399bb094cd9ef86e591207ff5/kegawovibukinisonodazap.pdf
    • https://la-klamm.org/userfiles/file/3599557167.pdf
    • http://hjtech.org/admin/upfile/file/29286103959.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/122626cfd70570f5ede9d1fe48dbd3bc/71699396813.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78cca3b6fa---32340264060.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/7u8ag8hrcnae839aj0hv6i25v2/fuduzogobakigivule.pdf
    • http://avtokit116.ru/!upload/files/ratelemuzujadenaxu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=clash+of+clans+th5+builder+base
    • 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_off0000f4d4.bin
ce915c8e7a95d263b54651669cf174fb9c587eb19d3de74a8568e7fed30f80e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 18528 bytes
font_01_sfnt_off0001261b.bin
fd3ddbddb39b5ed90dd63fdc89935d1bbe6dd7f16a9f95f8ca138696b0569183		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1261B 10976 bytes
font_02_sfnt_off00013f97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F97 16792 bytes

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