Malicious PDF — malware analysis report

Static analysis result for SHA-256 b519d784a006c6f4…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 11:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b4545cb47e3201a42c4781a04763e74 SHA-1: 93b08373324846f55aa7bfef8b2c01aff7bc2622 SHA-256: b519d784a006c6f45c46260ae0db12c93aef2ccec53e17f34b2ec91ec5ce989e
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. These links are likely used to host phishing content or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://eravukappalpalli.com/userfiles/file/15861571806.pdf
    • http://abwingsjanaf.com/uploads/files/rozidum.pdf
    • https://fleschimmo.lu/userfiles/files/pufukijepugepomejov.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe33969505---37319748448.pdf
    • https://tapuionoticias.com/ckfinder/files/xamonodip.pdf
    • http://gainliving.com/upload/editor/file/92543905025.pdf
    • http://skupka23.ru/upload/m/90026450620.pdf
    • https://datatech-int.com/userfiles/file/desubewalanu.pdf
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/73916276889.pdf
    • http://abbeytraining.net/userfiles/file/zobowewadobipalerubisuvej.pdf
    • http://linuxnewyork.com/draft/media/juxolipasurodowafekomepak.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131e2aa422ad---gajasunufuma.pdf
    • http://vigova.vn/Images_upload/files/jofopix.pdf
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/fojepubomatotomoba.pdf
    • https://turkeyinsurance.info/images/file/gafix.pdf
    • http://antonellascarpittadesigner.it/userfiles/files/55710423651.pdf
    • http://boschvietnam.com/files/usersfiles/files/bomivaji.pdf
    • https://seo-methodes.com/userfiles/file/zexisezifujetagezixib.pdf
    • http://vako.vn/app/webroot/uploads/files/4428248907.pdf
    • https://sainaudit.mn/File/nafokin.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/1739fe7aece67f5aba7a0de28b6b005f/pekonoremuxotimaxim.pdf
    • http://mindentudor.hu/userfiles/file/38270829057.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=share+my+google+calendar
    • 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_off0000d5c2.bin
bf46d8d9701a096a972ee6f4459d19d7cc0975de9998fae397ed78685920db7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C2 17576 bytes
font_01_sfnt_off000102b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102B0 16792 bytes
font_02_sfnt_off00011ac7.bin
9c99faa3402a6f8c994cf6e5befdf56a014e8de329a5953c308d88936ce8e0c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC7 10648 bytes

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