Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e4f86d35d80da66…

MALICIOUS

PDF

97.7 KB Created: 2021-07-19 10:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0dda811b61c0abd34cdba3dfecce6dab SHA-1: ff721c2d93f23df7af900911d802649acc0ddda2 SHA-256: 2e4f86d35d80da6691609ca3fb86b6b32eb46aeec340d34faf60d05809d1707f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm hosted on disposable domains. ClamAV and ML classifiers flagged this PDF as malicious, specifically identifying it as a phishing trojan. The primary function appears to be redirecting users to potentially malicious content through a network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://mariellatriolo.it/public/file/bujawafetepobuxi.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c39331c207eeb3cb24f21877b3cf5c8/lijetaxomesemuvopamolanun.pdf
    • http://codemessaging.net/ckfinder/userfiles/files/10418451982.pdf
    • http://porpora.eu/imagenes/imagenes_contenidos///dexeraxikaga.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b732f84e8ef8d0aab1c79520c7f8c7be/sijapiwusu.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/l620pdt86h11i4oqp3tdsrs05i/64825349247.pdf
    • https://projetovm.com/uploads/files/nitiwubowifan.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/qpcs1sukbi7hpo8l26s2n35731/25920154327.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/m2ks50uoqr6qnhhigr1l0f2va3/70231418857.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf7378761f---sodigulepakorudaso.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba35ed7533---47643703439.pdf
    • http://triatlonbizuterie.cz/sites/default/files/file/kotaweban.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace45c01fd9---94115705997.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf5696e7c7---tumepagul.pdf
    • https://badrivishal.com/media/femexijisozonomadunobipe.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bacf80ba07---71709181852.pdf
    • http://cmtdental.com/upload/ckimg/files/71413871676.pdf
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/58539155695.pdf
    • http://bet-balance.com/userfiles/file/gifosadupu.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/d9539c847b01d3c98088a104fb465ce7/vaselujibodamumala.pdf
    • http://giadinhlaurenso.org/upload/files/puxuzixasedekiwajuba.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/1c378930098a0b6cab7471045cfe878c/goxuzuje.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/8feb176b2fd0f8bf05df588528e6653d/38936686767.pdf
    • http://cpghollywood.com/userfiles/files/zajopudezetororidig.pdf
    • http://ucity69.com/clients/861769/File/bagoposeb.pdf
    • http://geologicatoscana.eu/userfiles/files/nixovibupepunibidodibagik.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=index+of+english+movies+2018
    • 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_off00011bf0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF0 16792 bytes
font_01_sfnt_off00013407.bin
3da213eebba3d77d78c2ca5fadd63c0fa0d79e435dda0b7704b3ea45d75d93ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x13407 11064 bytes
font_02_sfnt_off00014d73.bin
a0d25e08dc6a4699640a34fc895afe2fbe8ce3f805f9e839845757b13fca404c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D73 16864 bytes