Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e78d827238aff81…

MALICIOUS

PDF

112.4 KB Created: 2021-08-11 05:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 36976e0f64dd4d80276fd352adc31e5e SHA-1: 43077780d4fc3325e34b3c13fe191ea2cb8e5aa1 SHA-256: 1e78d827238aff81f454b4fe430e0c0c2f719124cf13550fa0948ab06216989d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload storage and disposable hosting. These links likely serve as a lure to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bec60eb786---mizexekagudotiwewatovol.pdf In PDF document text
    • https://esz.jp/img/editor/files/bedivagajawulurupa.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e94b200c7---65433877011.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/56377815931.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/lidijowo.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d4f4f2822---98861918975.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/fegomokaweri.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/kupofezib.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d406a9feced44c80e650ac01e6259b3f/dusazes.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4c2dfe3a00e6917f5eeba7ba68eb8963/50660580026.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f725c54fc---mizogimajobivo.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/92932025348.pdfIn PDF document text
    • https://chp-travel.ir/data/file/sitimaroteg.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe4579698f---98660935944.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/76991405628.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/5e7fa99953160e20b86ae1068872a08a/gorugaxudifovafolipuku.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/ronugugeminomufuwofokuzik.pdfIn PDF document text
    • https://genegurumiraclehealer.comuserfiles/file/zixawiwuguwoku.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/6fba32dc9c0a8a254cc6d6f501dc2b4e/8398318622.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/weliterurupogatuxoga.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/fd5b1a23080fc274906567944d83e6a2/42666980200.pdfIn PDF document text
    • http://builderall.info/userfiles/file/vamodifutomupufagopon.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/242b675a9ca340ca09418694f29ee1e9/posezatolojunivi.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/zumorozanoxuvamipufumeju.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051005264173499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=bollywood+actress+passed+away+2020PDF link annotation
    • 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_off000151ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151CA 10804 bytes
SHA-256: 5d453bf113774060c9bfe78ed18dd31ac544b451472752a1e1bdb53abcd095ef
font_01_sfnt_off00016b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18312 18500 bytes
SHA-256: 5186cfcb1adaa0a23737d55c37bc3d1642be314ef3e032cea7e52b73dfb0d81c

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