Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd86d24794da56ec…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 17:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b37fe1593cfddd35402aedf25b3ded3f SHA-1: 82c87c33cf9a615ff8c532d74732c152ed8127e7 SHA-256: cd86d24794da56ec47046372c538dc9dcc04c2239cbd43daad6402fda9fed021
156 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The presence of multiple external URIs suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=android+objectanimator+translate+example PDF link annotation
    • https://adsbudget.net/userfiles/file/gufipomopanimuwufef.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136028db69d8---83336106140.pdfIn PDF document text
    • https://tessuno.com/upload/files/6134752b5ed82.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/warusikosebebip.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/66431571134.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370a5d569b5---jisejelevasat.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/0e7d6ffe4df49ffd3b53d077b3db9be5/todir.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/jaminikonewubamodij.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/92164344748.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/saxoxogival.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0cc41cd0c---joxojewu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130fd8eb5f9f---39663374278.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/8145136743.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///zibogokutepug.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/mapogavokumiranuzudofiz.pdfIn PDF document text
    • http://mlead.net/images/e/file/59733375937.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613126f1bd3d3---zamazovijudepobovo.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/bugizuxenemamonofoxivujef.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/6868501928.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/27856065927.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/3d7ad5ea9f0e07dee3531f697adedf2f/virojesemevixifesovet.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/xojel.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133874708e15---90969906381.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/lifokaneketedubafunuwetal.pdfIn PDF document text
    • http://lulanjina.net/upload/files/1163405936.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_off0000d3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 11028 bytes
SHA-256: ec625546d7da9febe580fed9d639cc41474d7ee89084f47ae287747d649c4caa
font_02_sfnt_off0001054e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054E 17632 bytes
SHA-256: fcb2eee2b92a7b2d881d634519b69a27834b61fc79e57b721579c2aacb80280e

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