Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d713455af37641…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 15:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 494aca973504fc6dfff7d86b1eea30b6 SHA-1: 8fcf48a24eeaf93192aaf3e911a995e0efba8c26 SHA-256: f8d713455af3764113fb8a17f2ce3d61164e0efa7c0a722de203b3b67d909cd6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm suggests it is designed to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://tencanpowder.com/d/files/resazaxekizalezeruzage.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c47d4941---69065738865.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c3ff0b58da---gidajitabaloletad.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/logat.pdf
    • http://agcslohian.com/userfiles/file/ximegiri.pdf
    • https://isosklo.cz./uploads/sunoxor.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613305124cce9---xexibigefijagexudaneniku.pdf
    • https://10glazsikeyrosa.ru/file/72207907139.pdf
    • https://catbasailing.com/upload/fck/file/40952842446.pdf
    • http://smflow.in/admin/uploads/file/16727005588.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1611d569598704---29348851841.pdf
    • https://satybharat.com/ci/userfiles/files/zanorunexulavupe.pdf
    • https://bloomland.com/sites/bloomland.com/files/215783713.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ddad481f72e---tigateti.pdf
    • http://studioguatta.it/userfiles/files/xodevutafigokapapurogibu.pdf
    • http://predit.ru/admin/ckfinder/userfiles/files/41419075339.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be41a56442a---runedevudopabupexomowi.pdf
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/1413104686.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3199409cf3481c2a40fe94da6ef978d4/foketizokotajuvurezonoman.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/au01lgu98og3dlql4k4866uh74/32866756314.pdf
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/53302551547.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607860ceb88a2---337312198.pdf
    • https://riosemarescentrodemergulho.com/ckfinder/files/dulopu.pdf
    • https://astek-telem.fr/userfiles/file/dolupesonumubemak.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=form+19+pdf+in+english
    • 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_off0000db76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB76 16792 bytes
font_01_sfnt_off0000f38d.bin
2a1588b886930a57438ebe097e0c4e33466a4f72d9143684de28f2f8014d00e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 10884 bytes
font_02_sfnt_off00010c47.bin
d33df64dba9582f675b208253ab60bdff592b50c1ecf4300f4115bec0023c003
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C47 18792 bytes