Malicious PDF — malware analysis report

Static analysis result for SHA-256 a091524c78211fa1…

MALICIOUS

PDF

74.5 KB Created: 2021-07-09 02:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18e1b6c033000e5dd9deb90098b439c5 SHA-1: 737101beef567f0b7222b5aca7b54a50dc821ef4 SHA-256: a091524c78211fa1fd343f3349a09e631d566afbb690f2668dcd564f08d4dde1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains numerous links, many hosted on potentially compromised or disposable domains, designed to appear as download sources. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://bungefamily.com/clients/5233/File/31434130217.pdf In PDF document text
    • http://tpdw.pl/userfiles/file/xugasazuxijasamokeferabe.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f4959eb03---kubexudamowamefugod.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/lubapepawezuto.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/36124071326.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/80380054658.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/25192825271.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/rg6e9gp5ficuosu1ooe71vu7h5/71601101646.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/34844518224.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/71233368785.pdfIn PDF document text
    • http://stpatricksreunion.org/clients/84553/File/wutajawerafa.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/05d997422b1c423beb4d635068fafc7c/mukikirefavovaz.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/fanasexunek.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/946ed1765323546a6beca6bcb9fa43c0/wazodinofulelufo.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/40927059347.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/rodexirajeje.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6ec76c5fa383254baca0aded7bcc61bb/53455161619.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/dudojadi.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/65dc8c97843f47dd4c9cf7fe41dee66d/57748378114.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/2b0edf0d0f68afd3a591cfb107bcbe9d/nijakizivitevadavufolim.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/34276882214.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/2881843107.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/kekefediz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=watch+dogs+bad+blood+free+downloadPDF 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_off0000bdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60C 10884 bytes
SHA-256: 4690e6d03c9d09d076b6d7b94347f8617749fc7b219dacd2b9628bf2a83b33ec
font_02_sfnt_off0000ef16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF16 17392 bytes
SHA-256: 08152fdde18d8d5a294d6d098747c88b5825b40200d6ea9a707f81e16ce675a0

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