Malicious PDF — malware analysis report

Static analysis result for SHA-256 351972ad31b0e44e…

MALICIOUS

PDF

70.4 KB Created: 2021-09-16 08:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b70972cd196f4f12603da441b443927f SHA-1: 3ce61ad2762162f2ac47f0bf85c17737764dc272 SHA-256: 351972ad31b0e44ec459430273f6285436f72149fd347fc88d48b7fa04114ad3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing attack leveraging a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mydreamtuscanwedding.com/editor_up/wegobolowur.pdf In PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16134cfacc7064---xorimopufaveno.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/fogogujajixapunatezag.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4b1a9fb68---xipoxafinutorakaker.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/kaxitenukabu.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/da0a91e1aaeedf37deab8600b49f4ccc/zonatarikewusoparuzasimu.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/48371023055.pdfIn PDF document text
    • http://digifast.cz/userfiles/8751972778.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/6068505111.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/6190091260.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/57669838569.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/furunolitutig.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/37386112604.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/88549912862.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/bebesejaditufejetapevil.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358f25bc618---68580899463.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/8058073599.pdfIn PDF document text
    • http://cudicio.it/images/file/31346143227.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/5v8iq2q9p6a6jpv2dmmbau3jdu/80882405704.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210907192709.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/kugiva.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/43007645640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=watch+the+russia+housePDF 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_off0000b2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B4 16428 bytes
SHA-256: 11b26aa536cab9503697555b91f4deb71fca5a88a9df43c17ae12a885e6e9e0f
font_01_sfnt_off0000dd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1D 10268 bytes
SHA-256: 4bfeffd30b1f7ef5a62bdf695fd04b33c53d1e14c0155416e79165593e49efba
font_02_sfnt_off0000f473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1