Malicious PDF — malware analysis report

Static analysis result for SHA-256 79135180fc06efdf…

MALICIOUS

PDF

81.2 KB Created: 2021-09-11 09:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 424489253400d8a9caf9a6c8cec5b828 SHA-1: c506d22ae7f2cbd446e4c4e7b20ff66fef6a7b87 SHA-256: 79135180fc06efdf0775e8167ba2184a84983caecfede467562a2f0d2d0e8e37
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress uploads or disposable hosting. This suggests the document's primary purpose is to redirect users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=can+you+use+a+live+wallpaper+on+iphone+se PDF link annotation
    • http://ipsgroupjjn.org/userfiles/file/318454823.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/27171190164.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613467901a2d8---16050855263.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/fitinoj.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/99235398696.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/vofumapowefi.pdfIn PDF document text
    • http://xzass.org/ckfinder/userfiles/files/dezaxubibogobirabijoromeg.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/15740840228.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161391b88469f2---tajagas.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/fupisiva.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/binixisezovim.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/tosudevimosisul.pdfIn PDF document text
    • https://protrialse.eu/files/files/87667592893.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/36330401846.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/talunipubikegu.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/41325002404.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/movonevawinumojutan.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/1be8d874cef2a75f83531a6bb00ca11c/88985311467.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/rowojixewudiselojavujuv.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/27493667317.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/94653774231.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/powafonunuxufibigafu.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/45326946911.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134690dd20a9---viposuguxenepi.pdfIn PDF document text
    • https://aayams.com/userfiles/file/27793367456.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_off0000d808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 17836 bytes
SHA-256: 1cd7f76af32c1c94682f45f18021f3531f75c65316c4d4ef3f4617fd22a8cdac
font_01_sfnt_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 10648 bytes
SHA-256: 3ed96034177f80ba35817766bafaaef850c157957b33d26e466c56b5918573a4
font_02_sfnt_off00011ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1