Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a535802aae4a0e6…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 22:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e68399d70f07ff00a69e760ee9fc44f7 SHA-1: f9f528a130a568e6d4515624af00c15519870b8b SHA-256: 7a535802aae4a0e6585787ebf2eff8385b34c87afdec5c76fdfa3e119d84f28d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish for information. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=talmud+pdf+free+download+italiano PDF link annotation
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18b9aef94a---39424503244.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/7365024543.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160789093dec87---fudewoweranavuwinoxozirag.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/27254350938.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088dd33dc9df---vudutegajotimuroxapija.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/211fee036a31911f7cdf7777a1880860/fepabisoz.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612b296b3593a---46580460073.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/mowelavaf.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/362c8e0f3b046ce8bde5816980619d61/bomome.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/eae8a01fcea35ced7be9ac3d2f382377/tagodav.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/wosixajap.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/bfadf601d6c0557420e98187ffd82e5c/wixatijipuzejuruxane.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a871eeee0af---42422000686.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/66111514397.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac21b1368d3---wezizijivol.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/f0261da3d438819fedb9821a2450a2de/34986155307.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/kisemekoxeselifumiw.pdfIn PDF document text
    • https://2acontractor.it/images/file/bikufemoni.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f459d740eedc782c7b39e6966b7a54f7/tubovi.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/24769840457.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/2920625804.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f9a35e57c---simowileterilip.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/72087860548.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/koxilibesir.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_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 17636 bytes
SHA-256: cf578500456cbb87944f920472ff4069d9ace3adbe5e02ca78ee13726a93669b
font_01_sfnt_off00011b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B97 10640 bytes
SHA-256: e483aed38955aeafeaafe75a964122f43c0dccd6fd261b3d7a77ca9c2534a154
font_02_sfnt_off000133eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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