Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9752a21ded8623…

MALICIOUS

PDF

84.3 KB Created: 2021-08-23 16:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b7278b5de2695025c2420b2052100a43 SHA-1: 3bf6a29abff823e2865ac0996a2eceb2b067cc96 SHA-256: 8a9752a21ded862398a5e8a559ceed11869b6db2dc0faa83df286fa92a8818fe
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external files hosted on various domains, many of which appear to be disposable or compromised. The presence of a 'download button' lure and the ML classifier's high confidence score, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicate a malicious intent to trick the user into downloading a secondary payload. The embedded JavaScript likely facilitates this download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://banderlogclub.ru/Files/file/nupafigewizoj.pdf In PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ed5cbab05d4b62b05db2b521451271af/bifoliwil.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/88045051356.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/u21nv7m49lsas55jpodn264f12/20131331973.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/vobugelemuf.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/dd76fcb9ac5a96e76b9e70c43d11c999/2009755666.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/kiwoviwofitorix.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/zubenabubapakufo.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608762cb36f86---badazowizije.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086928871db4---47875210326.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/brrhtosaq82j86763vu0s4gs2v/lifitolulazajukima.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160848b63be370---83253085104.pdfIn PDF document text
    • http://whatdwellswithin.com/file/migilisobemekafev.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/wiwesonobaletizo.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/64644760512.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/putererila.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0ba09864d---wizimalozejojugaf.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a607ed38e---38684418492.pdfIn PDF document text
    • http://skupka54.ru/upload/m/5995822084.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fd38f0ae2---jojibovanino.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210620065413.pdfIn PDF document text
    • http://newcastlehigh1967-50threunion.com/clients/43248/File/76105385591.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/30900403727.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5b54dbd5---80278237375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=half+life+1+android+apkPDF 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_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5C 10360 bytes
SHA-256: 61a7e474097ef328c6d9968a345f70613e3fecd22b0965bbe0baef0d2dd65be9
font_02_sfnt_off000113c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C5 18812 bytes
SHA-256: c2ef84bf0da05acf3ebac93eb642103de43347b052e0ad54b68e937794b9960b

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