Malicious PDF — malware analysis report

Static analysis result for SHA-256 da617da226ada438…

MALICIOUS

PDF

87.1 KB Created: 2021-09-02 06:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb0333481130b1fe39f9c825431e4b88 SHA-1: 7855ac2fdfaf3f396cd7431c1ca82585802d540c SHA-256: da617da226ada43812f635f2aab2cae53cbb0c562d085840028b2cfd01a8902b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fullcolorspandoeken.nl/userfiles/file/83970321487.pdf In PDF document text
    • https://fptica.ru/images/file/tapezubapamijogima.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/4dad7881431b1b8d536f4c6b7e85bf0a/86333793576.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/sosovagerepimimurabiwamot.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/zexurizejubofidarokidisa.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608828a28498f---86592408748.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/32536107208.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/0e3fbfd61fed03b91764ac8d29de69d1/19378838764.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ce1a24cfbbdb097833d121ba4c945539/96558558593.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/42094564597.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ffl7n8pkflnafod2o98os1ousu/94206752512.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/534d89b093c65a6ea84fc89191be8cb8/33695510111.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/52179607180.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b83cc7e1251---93854355478.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b52602bb7e7---banepupeniwulejotesazugep.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/7u2esuhkhkue0udgpcdjahc5s7/takifilirurubakopijapesu.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/gpd52liqb7pifpehrbp7sh6o95/46884756158.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/64995457807.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/popipojewesibazugote.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/14857963888.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/a2b2fb00512733ebbd5acc5bbd176c90/75910166020.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/56640978515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=beatles+here+comes+the+sun+tabPDF 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_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 10696 bytes
SHA-256: 2ef5a3d818bc167823d1619e2bc42c070304ba150cf59bd8046d9f7d7b645de7
font_01_sfnt_off00010688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10688 18032 bytes
SHA-256: 776f2cf5d03d21722c8999dc3b465f133a9ee95d63108d85934caae91db41d8c
font_02_sfnt_off00013601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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