Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aae3708afe3ec79…

MALICIOUS

PDF

82.8 KB Created: 2021-08-25 18:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3723baf86d6789002aae6200c1169a22 SHA-1: 6db397a7ff2ab8b3d324a4cf695248a9c6edc3f6 SHA-256: 5aae3708afe3ec79cce86f61dd4fbc75d6845dddefab2a8985a53da7847083ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://smidgel.ru/uplcv?utm_term=signs+and+symptoms+diphtheria PDF link annotation
    • http://www.ecvbrass.ch/user/web/file/fozixenefenedazorakus.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a7895647b---lufapaduwo.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/48830005117.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/61032249801.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/17200954219.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210701_052326.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/55548513129.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/dadavolupepewegutarutemij.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/zekadawa.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/msrdo0jn6rgfi0gc6n5dhr13u0/zizadujaxuba.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/04c31b53a9f899efd08ad44c6fd489f7/10489672445.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/lodenutilimuvi.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a36188d735c635435811a7c1abbf347f/67830628242.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/9925d0169edf0f54125ca23b33229b29/74882881647.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/49981506916.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86607501465.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1d389e588---48232490033.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/98832157202.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a2da7e608940a020208dbfdbc5e402f1/wutubikovotaxikedijarejab.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7921b33592df02c021a189898f1e4cd6/lojapijufani.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee370cde879---34804790537.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f7d7066dc72c35f9085aec41618f496/lujade.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/26239967025.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/xedotamaxamizizu.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_off0000e0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FC 10980 bytes
SHA-256: 846449bbfb39c04ea12135d0fe5355773322c14f2edd792e25188214e61b1f55
font_01_sfnt_off0000fa15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11227 16340 bytes
SHA-256: bf56f63f5c40cdbec90e3f53faac01f053fefd0cb3bf199187d72de288bb949d

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