Malicious PDF — malware analysis report

Static analysis result for SHA-256 21aa4982d9f6bcfd…

MALICIOUS

PDF

80.2 KB Created: 2021-08-14 14:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 027d9cfc1da7c07191a0afef3b94abc2 SHA-1: 97ca61395102e5ba1b18ee444ad71d3809e62f61 SHA-256: 21aa4982d9f6bcfdc882741f95196163aef00617fbcb538fc6c7d98ba512708f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress upload directories, with numerous distinct hosts. The embedded URLs, while some are marked benign, point to a pattern of distributing malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf957d725f---39267675499.pdf In PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/036ef0aa1e2d5be72e555b9ef713efec/70196253750.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/85545181918.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a899ffd371a90f6eae57b06b340baeb3/66347235699.pdfIn PDF document text
    • http://steammining.com/userfiles/file/49261820353.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h1r2vk56i9s1agbqs3hodbui81/5483227249.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/22573079142.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/d6c7dddbcf16b5b7d6f3182a8178ffaa/36471713567.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/84358447934.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/76674171746.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/d5oompg1tmqrpcum47m4778b24/weralej.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/dolifusokememitakubek.pdfIn PDF document text
    • http://lulanjina.net/upload/files/44174079238.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/palinumefiwid.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/kubopejakizaneravodej.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/53092620006.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/74511e82be7a97fd7b9ee1c0fa561338/73445725444.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1a704d461c25af7157af91fe17f4a163/55478370433.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16088a31ec4846---zefewisiba.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/wajebupusolule.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43dd31cbe3---ninuval.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/gokusemovupejowatuzaluj.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/33f7856a59add7b84f22e5a20f6c5fa4/zerana.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/9crue4e8qgj7oarv5mfkge8ght/15687361063.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/6291e427d342d0ae9b328c09a0aa74f1/vuxapuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=exercice+carr%C3%A9+rectangle+triangle+ce1PDF 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_off0000d47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47B 17440 bytes
SHA-256: c9c17b64f0c0349a8d6beeaac45d78c3a7124d36793a80ac7f5c3b9d6a4e89e3
font_01_sfnt_off00010034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001184b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184B 10408 bytes
SHA-256: 59e0e8be95dbef849faa13bcb58355ba1255556e6c19ed898239063d32491611