Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b5e466a4af2302…

MALICIOUS

PDF

71.2 KB Created: 2021-10-03 22:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3b3ad4ef915eaaff8fcb6300635484c7 SHA-1: 81f014cb6fe07dcb4507f13d265396b4ad71edd9 SHA-256: 87b5e466a4af23028296492ef82a3bc77771830bc6706a393c44eecbf9245387
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://luckyfood.itweald.com/uploads/files/613dfb02cf550.pdf In PDF document text
    • http://www.lalorraineperdue.com/documents/fulufaja.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/43f2879d92586a78e3b70415a14057cc/teluvixizexunugedebu.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/nusakamur.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/dumigulorevonuk.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/183881468.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/7741738368.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/lomete.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f28e10c77---48472602791.pdfIn PDF document text
    • https://zzhqhi.com/d/files/87039567835.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/zibapatubagojobe.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/57904560164.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/xabijisolitupiteju.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/gizoro.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/63456097523.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/66974186192.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613aff0bd775e---72458440966.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109250212345509.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/gibekulixisibasozomebex.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/af30a7d1fd34ba0b0c3f30d1ee107856/84306231343.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///tezizupepimumujewutebefi.pdfIn PDF document text
    • https://binhvi.com/upload/files/97045338685.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/64079726158.pdfIn PDF document text
    • https://priscar.com/documents/files/voguzi.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16158097aee260---90605994504.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/79579426710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=lynn+hunt+politics+culture+and+class+in+the+french+revolutionPDF 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_off0000b5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BF 10956 bytes
SHA-256: ed6b5b50318310fb8fd6321a40038edbd2102b34d215328a45cff3fa9e4e56b7
font_01_sfnt_off0000cf1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1E 15352 bytes
SHA-256: b790e239f67b743259229023e3f4f20c93c39da71fd66b5fc0baa4b64dcdfc5a
font_02_sfnt_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1