Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17ce6b351b29f4f…

MALICIOUS

PDF

91.2 KB Created: 2021-09-22 11:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e560f1aae495d41943dc27a1e660e58 SHA-1: 6426771cb6242f6b85c10735c026ce64a20bd231 SHA-256: b17ce6b351b29f4f409b4b3a8fe4435e95adcce88e70c00d2718dcb53bb9bbea
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating a strong attempt to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body was unreadable, but the presence of multiple links to disposable hosting and compromised CMS uploads points to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crewmak.ru/uplcv?utm_term=just+a+stranger+123+full+movie
    • https://fishboat.hr/files/73221301372.pdf
    • http://elijasprojekts.lv/files/file/jaxapumumasefafow.pdf
    • https://bushregenerators.info/userfiles/files/15682514731.pdf
    • http://abbeytraining.net/userfiles/file/85275113464.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148c27693315---68462004286.pdf
    • https://agencement-menuiserie-var.fr/stockages/files/71524280429.pdf
    • http://moskvaznaet.ru/upload/files/57743075481.pdf
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/digojabezar.pdf
    • https://ratoempat.com/contents/files/bunijazigitoz.pdf
    • http://weforyou.it/userfiles/files/tupexowo.pdf
    • https://lapakunited.com/contents/files/80252743061.pdf
    • https://majubesar.net/contents/files/86383964333.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/70d1921b40c853c14e4795eb3eb62fb8/puzusuxaxofasorawutep.pdf
    • https://xtremefitksa.com/ckfinder/userfiles/files/80483800833.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131540c03395---wozafabalosudod.pdf
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/bozonavuzubewupekexidugo.pdf
    • http://massvt.sk/editor_uploads/system/files/tegajewoxorarolepo.pdf
    • http://srcchaika.ru/files/uploads/files/9731463087.pdf
    • http://gsmontaggi.it/userfiles/files/45526356265.pdf
    • https://clubslotalmatriche.com/calcas/file/jabubu.pdf
    • http://webinaris.biz/ckfinder/userfiles/publics/files/51362543244.pdf
    • http://olgapolyakova.de/files/files/67535481104.pdf
    • http://vegman-kzn.com/ckfinder/userfiles/files/92659839438.pdf
    • https://bibonatura.hu/ckfinder/userfiles/files/63258709217.pdf
    • 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_off0000fa41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 16792 bytes
font_01_sfnt_off00011253.bin
e83c84dd111560e7468b22755f7f92a29cbab14d542d42f9a8e1ae22bc67eb1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11253 19176 bytes
font_02_sfnt_off000144b6.bin
43485e8f519e991ce76346dedd6570f1f0886069565cad75585ebdf1e72dd187
pdf-font-stream PDF embedded font (sfnt) at offset 0x144B6 11060 bytes