Malicious PDF — malware analysis report

Static analysis result for SHA-256 afde09d4e91f1893…

MALICIOUS

PDF

100.8 KB Created: 2021-08-08 19:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 077dba128978eb47b7e14bd0c9446efb SHA-1: b4c56ca38e030009f77f644ecd80672ebecafd1f SHA-256: afde09d4e91f189382ef3aacb6c0ed8c8be913d6c7a7c51e4864ef6dc477134e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. The heuristic firings indicate it functions as a link farm, likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://wastran.ru/uplcv?utm_term=skyrim+most+profitable+potions PDF link annotation
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/a2130n7pf2q942reb5pp2m509l/65006505710.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/5ba2d1aecace094a31dc0d04eae4830e/98724599680.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/fukatesoxado.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086c47b6a8e5---bapigafedopikat.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/7e56cf576a850106fb6b701a58658b1a/7087277409.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/37074337927.pdfIn PDF document text
    • https://777mto.com/contents//files/59035920216.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/titazatofonufowiguvenig.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087bc7578c32---tagutedibirurezalow.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f85833503---23590228762.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/zejidepusuzudizigemov.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/kejugutamutewun.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/9066d31c66348e4bd5416f955db9e869/nitagudoruvarowidoruviber.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a775f327cd---punonatotep.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/donakuduxugis.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/87735727865.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/5odm6d3uks0mdp1ppcv5075n37/tatonedubosizoruke.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607281beb22c8---65824680555.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8daf3845d8a40e1fb3b79a63bcea5d46/61914125808.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/3ece353007a63232e5efa1b3bb87aa41/vapaw.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/pizajo.pdfIn PDF document text
    • http://cissi.it/userfiles/files/fibedebajidatomenut.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/0m4mqsgh1dj58smn56dq0j5omn/korubobamusukutixegegidok.pdfIn PDF document text
    • http://indel.sk/userfiles/file/vikimugobavasegeriwaja.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_off000122c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C6 18232 bytes
SHA-256: 7ad8a6ecf3031b5775da6584b053e7e02c83f934ca9ebeab4f92c82c4604adc7
font_01_sfnt_off000152ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AE5 10940 bytes
SHA-256: 503c9df055aa949ee7dbffa214269a266ad2d60cee198904239650964b4488d7