Malicious PDF — malware analysis report

Static analysis result for SHA-256 938c5564c7c0c08d…

MALICIOUS

PDF

71.9 KB Created: 2021-09-30 17:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3505180a53920b04d91b21530a6e5e8b SHA-1: 6ac864b9f93ac37921dfac0366c506088d88f678 SHA-256: 938c5564c7c0c08d4ac465d69e7bb98893641501ff02e2bc977a796f1a0c4cbd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and functions as a link farm. The embedded JavaScript likely facilitates malicious actions, such as downloading further payloads or redirecting users to phishing sites. The numerous external URIs, many hosted on compromised CMS uploads, strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=chroisen+2+mod+apk PDF link annotation
    • http://countryclaim.cz/userfiles/file/48985261836.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/c5cf8355fb2b182eaf10a74e5bb834ea/tuzizerasigivipafaridawif.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/31142951293.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/39463533388.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/31057437530.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/32429793083.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/sotagonupobukitadiv.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/molegapofavu.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/1053005706.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/66144291096.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/48633552015.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3d31744e5bbef3bba77be40c9fbcee94/fudosiropejanugul.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146dfc45f625---mubujamofitekesinos.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d3e80059e---tixolenopuwijototi.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/62191923724.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/r4j02btosi76utbqnclv5uf1ba/1420619774.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/zogikixomasopimekuwiragug.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614199a9a29fb---zozokafop.pdfIn PDF document text
    • http://tradotel-riviera.com/file/61048219737.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/53489948640.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/jutuwa.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/61584814886.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • https://yam-token.com/business_school/uploads/file/21347375508.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d8e6e447d6b237b0ab4b9d1ae7f47a05/4193464709.pdfIn PDF document text
    • 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_off0000b3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D4 18120 bytes
SHA-256: 419592407588fcc310420eef3d36b69c8393a87982fed70a43f2ab5a3c867bc4
font_01_sfnt_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 10756 bytes
SHA-256: f1cbb4c8a81536fd586ea76b9dc703b3cbfb828be101966bf88b2e07d64e2780