Malicious PDF — malware analysis report

Static analysis result for SHA-256 9106bdd81ae86564…

MALICIOUS

PDF

71.2 KB Created: 2021-10-01 04:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9f06d0ed849ecd60e972dccbba3f35de SHA-1: d68f017a187940b5bd1f97a326ccaf7a07bcdbe3 SHA-256: 9106bdd81ae865646bd7c06ef16478fcf6f7e775a238997fcf735f4e5b6162f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external URIs and is identified as a link farm, suggesting its primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of numerous links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=dr+now+1200+calorie+diet+plan+pdf PDF link annotation
    • http://suaups.net/userfiles/file/poxisobisawivasipelileva.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/kikelulubawowuweletapev.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/pagawugi.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77523773477.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/sivafisojatafog.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/47160520202.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109050535546440.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/55445900220.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/numemesugevijijatobeve.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/8583619966.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/karipaxijekoxaji.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/nafodijunelidudimoro.pdfIn PDF document text
    • https://kultmotor.hu/images/files/75947074181.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/82316214744.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/nezupabidakimadopep.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/3346e1d1f3dd34d2b87730f3cc7a5669/damojebujoridurevoniwo.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/rapagesimirodawumupa.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dibajenonoduvumitabusi.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/079f9a85a29ffc4c4ce546a4b764f5d0/lanimaronerexi.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/48317846188.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b8f31c7a5a08fbe9b63eac892ef01190/lajegoge.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/44836710293.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/40496507839.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_off0000b2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E4 16896 bytes
SHA-256: 69c2f0345e55a61553ab4af87692679157c365402766d2ba4dc78c999a145a0b
font_01_sfnt_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 10824 bytes
SHA-256: f4d981d93611f4b43a9c4cb078ddc70c1668a2520dc3e7ddecd76ee2d931c857

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