Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ca8fb9340322cd…

MALICIOUS

PDF

141.7 KB Created: 2021-08-01 01:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4a0055583f605df9719bb1001a78f12c SHA-1: 9f3ab8dcf4a419a1e546be7e7ad193290e6809c0 SHA-256: d3ca8fb9340322cd9dd69384ae425ae85eabec464b33331d739997066f9c2419
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it contains malicious content. Heuristics identified it as a link farm, with numerous external URIs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 http://joyearland.com/ckfinder/userfiles/files/zopevuwolazagu.pdf In PDF document text
    • https://gilbertems.com/videos/file/benezuluxisonegosaz.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ukr9lrkh7upoh1s97f97jjbt14/12561949967.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608653a9107bc---13839792967.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/lgiq6g2m78ajs3odvi9cgq16u9/63607143598.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/9be44f4ed949961af341e61e0dfbc1ae/sisaduzagubokozin.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/giterixaxumerunuzobufula.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/2d2ef6f7f78564064e8a401f8c61488e/74459097586.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/53021980520.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/33087046016.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab398979d58---40462888161.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/10562141687.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/177c84affc7eb43310dcadeba9ddd6aa/32016337017.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e4a886ea42943b004ef185fb6764f6c3/febovapabogodivuvaxujex.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/koribofonemubexonid.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/pidopiwesazamur.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/v5i0gdvrko3vruptjddljt61p6/48020786635.pdfIn PDF document text
    • http://mylodge-naoshima.com/xamebixikokotegupo.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2fe2e2622---36683741511.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ab9a034tmnb13kmpuh9rqq4n20/kazolewe.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ac9bb4523---nuruvuziribibajobunirikov.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/dawedaregizalubewador.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e2148a65048---33299502357.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/0001115ef955e0699eaf59571f64bf66/tozajafa.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/neligazoguwaxekulisi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3c981fddc---11925967333.pdfIn PDF document text
    • https://drsoleimani.ir/userfiles/file/napenokupikavogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=le+portrait+physique+et+moral+de+didier+drogbaPDF 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_off0001bc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4A4 11192 bytes
SHA-256: dfcf8538a67464ee93bcddbe56758b232c3f1084d59071fd21400c79f349aedc
font_02_sfnt_off0001ee19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE19 23052 bytes
SHA-256: da6b10e983f31e7bb077b7aa34de2df4bde452452260d1aed916d7cb2ea8b3c8