Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4adb0e31794e0e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-23 05:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a52ad6347503905937acf0c7e4fc545b SHA-1: 6d0912ca5a40bc6e703d003a72c05cd82c94bb1d SHA-256: 2b4adb0e31794e0edfa0cc766e5b24160f2998e10c026cb7dd37dd587c5e4acb
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://braus.uz/images/shared/file/8513443896.pdf In PDF document text
    • http://freewest.at/85180771432.pdfIn PDF document text
    • https://ibextrail.com/editor-images/54940724082.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139265b3af06---8029674116.pdfIn PDF document text
    • https://acmfashion.vn/uploads/files/91127074461.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/24982940114.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/f39785d663f47a80f71cf778352192c1/98656860945.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141141604ab3---sodudeno.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/24556835364.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/51235584224.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/58e521d3ec280960f68077b67bc0a882/77900135909.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/zenefuzegalawazamanitegol.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/zotunisegatigat.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613198037eb77---gugetegolafukojinasib.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/luzinijejidagaliji.pdfIn PDF document text
    • http://kyea.org/imageuploads/sazoju.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210913171645.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/75261059785.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16145c588defee---noderomoleraputewirarur.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20219108328.pdfIn PDF document text
    • http://sinners-party.de/media/file/59866115558.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/330db869201b1c2fafd0ef7192398e99/feriwenulu.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/71997838401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=home+alone+2+watch+online+123moviesPDF 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_off0000dfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 10880 bytes
SHA-256: 871265f52dacdc12fcc76915e44a1a16acf2abb7a9d74dd8f380c8ec5cb839a9
font_02_sfnt_off000110ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EE 18180 bytes
SHA-256: 9dd2d7c83810a32144f0628df2d205ce7bd4c1190eafd4593f37420991d1efdc

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