Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a56202ce55014f…

MALICIOUS

PDF

94.9 KB Created: 2021-07-24 23:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ab650291e42cdfc2a4cf4cd24c8d349 SHA-1: 92cae88ddb98b3838b623625073ccc6ebd50ed54 SHA-256: b9a56202ce55014f80b558c9a9644cf4dae2c5439646abe24272b7dc8ff5ce89
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/sql2krbinqekrnvsnooj6op1s3/19651194382.pdf
    • https://led7.ru/file/wajimewiges.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/c821828f886da4cfadefd0779d292008/temijavinadigubazomave.pdf
    • http://haiphongcontest.com/images/files/22406690954.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c0ba2eace---kulozal.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-6-5/20210605100345357929.pdf
    • http://jun-travel.com/userfiles/file/nerupajubibovuvebog.pdf
    • http://businessvaluationapp.com//fck_files/file/gonujamimipujizaririxavi.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a016506ac---piwadage.pdf
    • http://portalcom-b2b.es/img/user///file/_0649595001619992054.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/6hr3g50trjbr7bdc3cbtbd4cpp/fozidufesuzufunowaka.pdf
    • https://airtelco.com/data/users/_/email/files/96702258907.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a49fc21f8---75141121115.pdf
    • http://cascinamana.it/userfiles/file/kukeduruzozevapuputobi.pdf
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/komal.pdf
    • https://thehouseconcert.com/ckfinder/userfiles/files/nivelixovujefe.pdf
    • http://gayaarchi.com/userfiles/file/20210611210447.pdf
    • http://baigeleather.com/userfiles/file/ratala.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/701a25a6fd5f1c027b3192bc88624056/22431590141.pdf
    • http://rotarycochinharbour.org/ci/userfiles/files/26094990560.pdf
    • http://jnnycc.org/userfiles/file/97709324924.pdf
    • http://al-farh-iq.com/upload/userfiles/file/tutewi.pdf
    • http://ibookingkr.com/FileData/ckfinder/files/20210707_B93629F569E42802.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/f34c10c0c4f2ad9b8206feb84830694d/xonilagubekepurat.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=apa+punctuation+with+quotation+marks
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f84a.bin
202f9fcfcbc67f067a5152718a764607b64aaa8bed3503059b2a2257c1c93fa7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF84A 10868 bytes
font_01_sfnt_off00011154.bin
42fc5877f696002c3ef819035ac60b7d35ffb1ba81b1707cb950a83df6595d5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11154 17608 bytes
font_02_sfnt_off00013eec.bin
fdc3f250e16d4eeaac0151c08e1678493ac6cc67090af3137bc700c4cd553891
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEC 16348 bytes
font_03_sfnt_off00015543.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15543 16792 bytes