Malicious PDF — malware analysis report

Static analysis result for SHA-256 d035fcf638e5d273…

MALICIOUS

PDF

92.9 KB Created: 2021-07-10 06:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93cf57b9fe04f019a0cbca1c15d62150 SHA-1: 7fa21d292bc388ac9ff2cf11c47c709904449a91 SHA-256: d035fcf638e5d27381072b31c1b538289a6ec0ece009e5341d7648b8f00a9a21
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdb8fa18ee---30184039888.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba0588d5d---16013265467.pdf
    • https://slide-bearing.com/d/files/gobafewolorafobejem.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/cbef36b9f4d041c8702267f3697bbb61/gaxuvidarasabila.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/56012522571.pdf
    • http://lideparts.com/userfiles/file/1622924419.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f850a5bca2---98173664047.pdf
    • https://rumputhijau.com/contents//files/getadi.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/xasune.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/k4ifnhbp3nucnmhg1fal54sv6r/dofutofowipituvojuweviwa.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/11f1cq74farii65ojt87mq9j41/40354388072.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd5a13907b---33104194612.pdf
    • https://hondamienbac.vn/userfiles/file/koxobifoji.pdf
    • https://marcuspietrek.de/MARCUS/files/file/25451686203.pdf
    • https://digiconelectronics.com/media/zutekibarulovurowemepisu.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7b2557e0d---muxagu.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085c37588081---bokuzosapuvemazobadefomo.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbc8ef2554---bajudozesuparip.pdf
    • http://stardentalcare.org/userfiles/file/felewezibaxuvalelodapowev.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/768adea9d5b81d6ab01eabafa24c3de2/netita.pdf
    • https://rivaflo-south.in/userfiles/files/rirufifebozetovelijixum.pdf
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/30026388144.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/rkkt4pk6jqenpl4la5h1f6fgnm/tanabukagegukibepu.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7c64ce3f0---moresakupamotitivabunosi.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/da1678a38962c1153355f996ea862137/21804586471.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+causes+you+to+go+blind
    • 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_off000109a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 16792 bytes
font_01_sfnt_off000121bd.bin
5ead71442451cd1cbda003e1f88f9d8f9a6787e13686832698f3d7b02488211c
pdf-font-stream PDF embedded font (sfnt) at offset 0x121BD 10896 bytes
font_02_sfnt_off00013ab9.bin
de1c64580e50b131fc88bdfdbcbd170d367b56a4f98379e79569321d23cf6942
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB9 16712 bytes