Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb843f27d45c995…

MALICIOUS

PDF

84.9 KB Created: 2021-09-15 16:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80bf2e1b494ed8f63be4b7fc3c5a6412 SHA-1: a76ccdf378219c955b67091ea01386902e51110f SHA-256: 2fb843f27d45c995c07fc2ce47f986892abb90e3c3b242c1d9ca05cdd332085b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for phishing or further malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cr2tek.com/userfiles/Proj_Name/files/fudodejafolejaberip.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/663a5477d63ab760b6c68117c658d863/kuvarobava.pdf
    • https://ambalatender.com/upload/files/62979046495.pdf
    • http://koszyczarek.pl/userfiles/file/15017398320.pdf
    • http://tantusmarina.com/UserFiles/file/67888173174.pdf
    • http://grasslandtj.com/upload/files/86529789673.pdf
    • http://radecznica.pl/userfiles/file/napemasaguj.pdf
    • http://rotarycochinharbour.org/ci/userfiles/files/siluwixolibexepo.pdf
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/poriwam.pdf
    • http://quartierdete.fr/uploads/fckeditor/file/ginejufunimiwawozawur.pdf
    • https://agape4u.org/userfiles/file/gelapideraxegujezerewas.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131782c74be5---92867975038.pdf
    • https://foursservices.com/nbloom/fckuploads/file/78657036327.pdf
    • http://murielbellhomes.com/userfiles/files/88494147406.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6f7e5dc72515a034b3da10d672f65976/lujesatutetuzijamatokese.pdf
    • http://studiocalcinoni.com/userfiles/files/77034192945.pdf
    • https://krygina40.ru/UserFiles/File/nofaxogajilerakujune.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f175a1c4b3---miritewefedulefowifizo.pdf
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/nukumopigesu.pdf
    • http://inphilong.com/upload/files/57354658043.pdf
    • http://hoclaixebinhthuan.com/upload/contentFile/file/38165169103.pdf
    • https://vetamblj.si/ckfinder/userfiles/files/37371759638.pdf
    • http://saddabro.com/userfiles/file/sutomatag.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dragon+hunter+hearthstone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e805.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 16792 bytes
font_01_sfnt_off00010017.bin
c6b83725ca706c4e9390086333b98197fe9ac1f749ef5836518825d0dc1bcabb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 18128 bytes
font_02_sfnt_off00012f2f.bin
ac2351b92f2524d4e60bdfce433a40c888fe091cbaa92eac8d17194b2e3dcb02
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2F 10348 bytes