Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba9e3876300d3c1…

MALICIOUS

PDF

81.2 KB Created: 2021-08-19 19:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8635c91e935fe8a8ccfa43245ce485e9 SHA-1: 51305dd2ce7bcda1a364ce0ea1a24caae3303d95 SHA-256: 8ba9e3876300d3c11cc22ab70f0e7c7c15fb33a30385473382e5455a664e8da0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and other domains, many of which host other PDF files. This suggests a tactic to distribute malicious content or phish users by leveraging SEO poisoning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://xn----8sbnbd9chja.xn--p1ai/userfiles/file/16153186155.pdf In PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf1cad8f8---remodosivirakopogejade.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1c9e86e06542bac4033918a2578b8c50/lowuninifoduxuso.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160831102db43b---saweporigosanug.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/69451178445.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c27cc89899a4e55751a47802d4e96f4f/82976001079.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842d0b98734---81044475291.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/53875732966.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/q8dtom6lu2q3fqc5r0onh8q27v/nuwurelapot.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/befunipegekow.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607dffc4ec615---42994950119.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/46139214930.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/10091498488.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e93d32ab351---15571116986.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/dokoxeluxivisiperawere.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/pemodalelujufimanolol.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16105b14dd7617---49816728368.pdfIn PDF document text
    • http://computerdoki.hu/user/file/70193926.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/95611733047.pdfIn PDF document text
    • http://bptramptour.pl/files/file/modiled.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/71681306571.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/1aed9e8a343d9cdd5b6d241c908926e5/97499097399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=fondant+cake+decorating+for+beginners+pdfPDF 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_off0000db50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB50 16456 bytes
SHA-256: 746aa87ccd1fd88e6a0eb9028c27c5eaf7360ff38fbbea21b052590f68cd041a
font_01_sfnt_off000105e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFD 10960 bytes
SHA-256: b8616004586b316004a8de9beefe6d79d8b7d693112ea000ccafc8de057b5798

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