Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94b89aa2572a6aa…

MALICIOUS

PDF

104.1 KB Created: 2021-08-01 12:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7fa5f3414dd2df2e6973149bf652690d SHA-1: 169217729dec6abaec751be5ced609024aa0c709 SHA-256: c94b89aa2572a6aa599a28cf8be795e6e2d7693a62dd4f27cfcd705cf47fcf6a
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be0481a4c0---61252798376.pdf In PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/7ebb7e94d38cb33199babd57055777ff/jawexeluga.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8c466bc91---losixare.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/8uohv0ev3lj59k0c9dgbb9t22m/17663568773.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/rodeja.pdfIn PDF document text
    • http://anm-av.de/uploads/files/zokavukutenusoxav.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/wunovenasuluwomaje.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45602682394.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621461758.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/4e6041d3de2506f199e6fb318dbcaf4d/vakegeresurobawosekabu.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/49144747067.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c863444d1af---pukezofunutezidetazelura.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/90538509843.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/21531709909.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/90872432086.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/josategujek.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/gukemifivinad.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6bf10c8a---tegezezokabibe.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/vinorisuzinerekarajutere.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/babozezesoxofupet.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16088507edfc9e---zudebamamosoxotezarevosek.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/xojikajuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=agricultural+science+focus+textbook+grade+12+pdf+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000130d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D9 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_02_sfnt_off00014676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14676 11468 bytes
SHA-256: 63f90593a5f55f325763bfbacd7c5320f3d4148d23f03eed40b235bc8b526f6f
font_03_sfnt_off00016180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16180 17740 bytes
SHA-256: c118e1bdd9f3f054847fa7af572863c9e976fecbd1f49f177eb5760f799ffb1b

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