Malicious PDF — malware analysis report

Static analysis result for SHA-256 e45b3302e9b818fd…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 04:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1195776b59cb4503d207020bca30350 SHA-1: 9f6f7cee8306955913c3230f808e9e08a6b1e695 SHA-256: e45b3302e9b818fd3e66a2391de358e876201189920ab200ad91a459eb02b4be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and URL targets suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/533ooqs52vislte65vddm54oev/pedofiju.pdf In PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47a368a7b7---wobebujital.pdfIn PDF document text
    • http://www.heksan.com.pl/file/31635093180.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/32477150e36aa855332004e40a729775/tigetogexinegub.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/08/01/file/20210801_115355_184.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/wajedebemibuvuge.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/gameguritoramaguwejajuz.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/67181492371.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/begipegota.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e803ae5b3---pisuserifumanasot.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7ae0a2bc3---luzidiwapusukomukafobojob.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/novilofoziribevi.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161037f05630ab---89862684790.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/gufibomamizuzox.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/6827280848.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/49475380228.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/rajuz.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/benobokiva.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ee0e7dd79---52111261734.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8564278610---jewepelowusazisopulu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d21182fec7---zusujetixiratutapasud.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/075e37f53186301f1c3bd52836874a0b/7053357926.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/40f85f80ec2a6c53b880a25f7545d848/87283537600.pdfIn PDF document text
    • http://apvn.info/userfiles/file/63234605620.pdfIn PDF document text
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/94520613929.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/99227945438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=lattice+multiplication+2+digit+by+2+digit+worksheetPDF 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_off0000de14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE14 11572 bytes
SHA-256: fa35a0fdae0d2508baf0efb8ad80a325b6929a84f051f43342532b3fda58445c
font_01_sfnt_off0000f907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF907 18164 bytes
SHA-256: 749347412a5747f2eb1f841e486ccbe791797c58a352dfc536c558c4f9833689
font_02_sfnt_off000127cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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