Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd891238d3b3c969…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 02:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: affa279ffd82687f7147e234ab4f4b46 SHA-1: 843ee27950db760dffbb04dc0b93075b81e18faa SHA-256: fd891238d3b3c96909d449f6dc1da23e2bc78b6b9609fe741e12c8a26e903ef5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves exploiting users through these links, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/71a659476d8facef688430e072a20b46/12066979877.pdf In PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/58032124555.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/81578281873.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/1cc8e595506f7463c513238a3bf3f9e8.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/kukigivikulidepapit.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/4594055619.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e51397af26---52170177683.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c222010e84---17641291691.pdfIn PDF document text
    • https://bem-sa.com/img/file/forofetilono.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3fbf9448796384167d4105142c4f6e6c/fixasisubalusezufamatages.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/60716088566.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/e9ea61d469f8315dfd488a81b2175060/52566567040.pdfIn PDF document text
    • http://salkim.com/userfiles/file/galimavibuto.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/88470243035.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/16855887517.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/72592546997.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/pajal.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/gadixofozuwedokika.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/somijubibawupakupizasaju.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ed867cac7---65094481654.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/rosinolen.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/vejakinalinunuzen.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5484dd0671c035e3e4f2ccc05faf29c6/meteripubipapifu.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/44af2d8cd7d6de1af4680bba790f51f1/rosiv.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/eea65879ee802514bfb7480fe395bc29/40598341657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=infant+cord+carePDF 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_off0000e5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 19208 bytes
SHA-256: 11a06e4a50fde66f2e755b8a054b44e200fea2dd85c3bfc3d950b1e08227e1f8
font_01_sfnt_off00011696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11696 10116 bytes
SHA-256: a6a1ab75c952c4c79c4e8fbc318925e612425d142201b4036df357efd034c0c2
font_02_sfnt_off00012d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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