Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea9fbdc0f606364…

MALICIOUS

PDF

71.8 KB Created: 2021-07-02 02:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cf9c524af4731ece7f377ce8127a629 SHA-1: 3638aca471247462d59dbc041b13c13bb4c2416e SHA-256: dea9fbdc0f606364533da5edcf024f6da524c150a89cbb91196e2b8a1ab70671
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning model as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains or compromised CMS uploads. The primary purpose appears to be directing users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=fcmc+clerk+of+courts
    • https://skinrepublic.vn/webroot/img/files/68544020757.pdf
    • http://arnold-sitter.com/CKEdit/upload/files/pomaxedasoxibaneja.pdf
    • http://exoticland.bg/upload/files/files/sopipakijenudapopagetuziv.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39ed46637---94137460368.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/djpnvoikd69va0nl501vpv01fe/14492205121.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/1ebba8e2ebece31a3f287702cc176f37/67099649109.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8550a9839---16906682577.pdf
    • http://ned.ru/uploads/files/titiwalug.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d738ae006---mupogem.pdf
    • https://kvkumariajnkvv.org/singhania/downloads/file/raxotosaduwi.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/jot1g48bret6ffh49me7qklb30/fivifivugesutupetotekofo.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/05e2d1242cf47390e7a40eca444fd8c2/segajafareguranonogomob.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ee999e02d.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083a1c52370d---gasakadedulola.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607deef4e0f4a---86869227651.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/86717008421.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b35784a9888---kujekiwokikilevob.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/521aeadaf8e72fab5172478828c43513/jifagowavirob.pdf
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/92359706946.pdf
    • http://biomassasia.net/data_ed/userfiles/file/sedefeligunezumemuloj.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6aff2b091cc1de01409c8e0b88241553/44804734727.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/2f4d849955f5bb3f2e780147667d2644/44147299830.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/68716732608.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607116ed0b006---sowavagededaxazotofine.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_off0000b980.bin
42ba20751892af989784178f4789a5e74017585614f1411253dc4d0b0a38c464
pdf-font-stream PDF embedded font (sfnt) at offset 0xB980 15996 bytes
font_01_sfnt_off0000e2c6.bin
a6f6cf581a1a8f38edee69722a50c5744503f09951cb58d0f482eb9138cb4d67
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 10308 bytes
font_02_sfnt_off0000fa1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1E 16792 bytes