Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3bd7109425d0f44…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 15:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 28351fe943ab3b16b44a40da1de412ee SHA-1: bab09358a274f31b4e690dd48c6b24df30c2c589 SHA-256: f3bd7109425d0f4453cee24e88f1d9f01bdb53914fbf928b745d114eb72b536c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file, likely used as a phishing attachment to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=gta+san+andreas+apk+download+mod PDF link annotation
    • https://adepotcustom.com/UploadFiles/file/20210913141036143.pdfIn PDF document text
    • http://charivne.info/images/file/kuwadoferomeruveraxakup.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/rumuratexajonosoz.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/740kvd71pu3errj3d100r6rju4/71128699106.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/mazenapakirajez.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/14789633045.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41013452851.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/wozitakenovuzog.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426a9b8272d---81529620078.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/posezulifevodokimozeteg.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/86157866048.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/sifetokafoxaxukewaforub.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///63777117858.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/4140917900.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210903_0F50A4851BD42719.pdfIn PDF document text
    • https://akemi.ro/hirek/file/pemitolukonufunup.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/38657803864.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/59892376990.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16144271c2b891---kaxuzebokolixi.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/89439522248.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/87096960377.pdfIn PDF document text
    • 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_off0000d180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD180 10680 bytes
SHA-256: 2653278c6e9ad145282dc858b25ff46b0ede67a748468ff77ba5c658695b057c
font_01_sfnt_off0000ea15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10227 17304 bytes
SHA-256: f1d894758cd202b362a35d8806925d889d8fb573eae7a08b1d0617d1ef993c0e

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