Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a34e5934bf3834c…

MALICIOUS

PDF

74.6 KB Created: 2021-09-20 11:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72ecdc82c0dc7e378f6c5282c11577c0 SHA-1: 79101228375b84e60f39f9441e9e59d9e3540a38 SHA-256: 6a34e5934bf3834cb78cae32b2ef78894ef3cb6e94e89b7724eafb1324fc5cd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of multiple URLs suggest a phishing or malware distribution attempt. ClamAV detection further confirms its malicious nature, classifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=download+pokemon+alpha+sapphire+android PDF link annotation
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144b81a6bbb1---71288337779.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/razakidagifojeforumak.pdfIn PDF document text
    • http://teakdeck.pl/files/file/35343636121.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/tipagusufisixozutolurami.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210902045741_ir21ck.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/nofudasibowafe.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/jebaxofivaw.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/kuzojupijurobore.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/49389323087.pdfIn PDF document text
    • https://loctra.net/userfiles/file/nowizizuzajipokosutipivi.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca91135d89---24554458308.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/jigolatafat.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/dukuxituxodapopuxolexo.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5dca3962a60cd05ede51c1e2bac25e6f/65065876035.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147eab50a801---57895762302.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/54460994183.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a6b9a2051---34097005258.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/jigavagaxudixedabubakubom.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/wuwawovagoxi.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/48340602867.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/difovavewededogi.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/80176134496.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/bavuxovuwuredovumusawoj.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_off0000c054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC054 17264 bytes
SHA-256: debb1ec000ee94e5dce975ea0761ba4b3a3d9de1e382a19b601827b15107e572
font_01_sfnt_off0000ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001045e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 10736 bytes
SHA-256: 383ef5f7ce584d0b4c5863a79f6cd8e0165db00c2f33d19a3dc876bf3f0312e9

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