Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b1dc87a72a82a9…

MALICIOUS

PDF

118.9 KB Created: 2021-07-13 21:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: efa2969b8ad018e0cb0f1746525d9054 SHA-1: f99b6599b73ec5cecd06832e41ddd538ffe86995 SHA-256: 38b1dc87a72a82a94164bc31010db565d3e154fad80b11b9d03e24ffcaebed71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://evola.it/userfiles/files/pojukirajazuroruv.pdf In PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883d759baae---45775106548.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a0525d3573c903f1d3339becea1ebbf1/35381295336.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/vipezugurimag.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d5ec53536---90029706483.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c511bcd3a---55332273210.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/ka1l8bk9270kuc4goe2l4neu00/91443153583.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dab7579a83---64192782759.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/0aca59f0e19617d7b59a93531e33b37d/bofuduwirube.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fd672b561479758a734cfb55ce1168e1/11138625911.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/xumapudu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/pe92rl23cvr6ief1sua6jmafqb/67561696949.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/7573586768.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/wasula.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/pilokekibol.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7dc8158d56---xunatixeloxo.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/56925115150.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/eaf9e1b0f59369a8cff620e96953a0bd/tixakuj.pdfIn PDF document text
    • https://foulardfotografando.it/file/40209216264.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b0e3a2c0e---pitugedimavebuwo.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/73840552270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=doe+a+deer+piano+letter+notesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15544 18988 bytes
SHA-256: 73bda53ffe722d8bd8494582a14119d1dfcad4e20a69f1894348b812524fe21d
font_01_sfnt_off00018728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18728 16500 bytes
SHA-256: 1d819a10d0f46647b8583d59b6814def3384a5520868de8981ea7c774ac40ecb
font_02_sfnt_off00019e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E37 10388 bytes
SHA-256: c1aa243c67e1bc1a4a9eb5e96eec2495b986771d760e8097c8dfd45932bee7fb
font_03_sfnt_off0001b5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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