Malicious PDF — malware analysis report

Static analysis result for SHA-256 1acaf5a490d0f52d…

MALICIOUS

PDF

90.8 KB Created: 2021-08-01 14:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6b6cdcd517bccbf301999753adb9f81c SHA-1: 3de51e6da377e4504cec80a9b2887a0d652506af SHA-256: 1acaf5a490d0f52dc82831c284abd6bb45410b989a1a8881ffc54ae8ad3e6645
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation through a link farm. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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 https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f3789f89aba8c000c272267eb8e17041/tovezebawitamuzarepujibo.pdf In PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/4c45ab082547141da822b41fa370f33c/96749876497.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/53928276512.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ef2ba4859---22016199808.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b2ccb0e9---toketerora.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ccd832866---gifiwolemevofegufe.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/lujivonin.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/lofesemifulopexozanopewu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/8ab99733ee4745639a31f4ec7e61102b/10914801982.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/2831303494.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/16196811058.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763914c3d3d---danimikinikob.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/4d40e48b2bdc9784e5720de3bd00e251/4414274080.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c0fce30d3---89679363918.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/i5aatq90bpcn74nl5fm0mspqu8/26376778902.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/11522627412.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/39590236224.pdfIn PDF document text
    • https://pr-dienst.ch/file/67987437046.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gumedi.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/superupinenirusesat.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/xafulujupomolinukazip.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b070d7235f---loraxusipujewigusumuv.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/tebaxop.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/ffe9ae83f461f3e6372c87989086c896/39236888987.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/10761387634.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ba34b09a1---vuseporojuruwadosisu.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/xorawofemugimo.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/33388397581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=can+you+browse+the+internet+on+samsung+smart+tvPDF 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_off0000fdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF6 11044 bytes
SHA-256: 2172c218b0ef1bbd595efb48a6844981a98dae39e1867b854950304505db7a78
font_01_sfnt_off0001179d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179D 16836 bytes
SHA-256: d6677f3937019648be97143861a96440463a73446099aef340a2dc8b0a068237
font_02_sfnt_off000143aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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