Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b9894618ccd183…

MALICIOUS

PDF

100.1 KB Created: 2021-06-29 00:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 05751076a6168783dab2843d21547e74 SHA-1: 6785255534bd9a46b0374b6cc2b965f0ed4d6071 SHA-256: f2b9894618ccd1836db0c4333abe6a0589b7d6ae3da0d2b07fabb2dc20a11874
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm. The embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://marjoyunlar.com/calisma2/files/uploads/xemita.pdf In PDF document text
    • http://newgatedesign.com/Images_upload/files/lekujelixuwaz.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b2fd062e---38007098675.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e5cd06d77---vowugerobegomilixavigizas.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/wivadogafedul.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607c834f34426---21544432018.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/rozerebelabom.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/tatilujamelabud.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2012ae8c5---79460239370.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/00410b741647d6dd09f3bf82cd54caa8/75029331576.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078a69d274da---31507530576.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f74ec113002143e1757118524da8648d/vuwadiduwufonanula.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/59513266501.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/93815656038.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/117c9e2231eb342f258697283ca57f66/kujijiritikikusiw.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/55641735157.pdfIn PDF document text
    • http://mooneyes.pl/userfiles/file/17542228202.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160846464cbe04---26140910244.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/73859023818.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608032b5d45c4---82588480158.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a3d830547---zurevetiroxoxakepekumi.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/b840c8e947da61cb0a31ed0e1928e2f3/newaf.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1dcd22ef8---zifuxakexikog.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/kopifiralujo.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/pilege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=fall+in+love+at+the+first+kissPDF 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_off000124ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EA 18072 bytes
SHA-256: a8cdc29687a1f66e109b800d47c629d236f827e7a241443fa95749279ee3d7fc
font_01_sfnt_off00015366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B7D 10448 bytes
SHA-256: 6d8711ea91dd915635a16d923ac66c90dc5c81380324beeaa4d556efce9e9ea8