Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba941a6659ab227…

MALICIOUS

PDF

119.0 KB Created: 2021-08-01 16:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff9e303e5569c33c3d6082ca0fdf4b12 SHA-1: f15ba2767d75800dbe8939a3544e56687b330a0d SHA-256: 1ba941a6659ab2279943ff4d7b382c8188c5a00d9e3e02b74d720d3d001b4353
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure points to a common technique of using embedded links to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://asiavent.com/UserFiles/file///boxulokuviwi.pdf In PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc76a3b079---molikeguw.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16072941a9dc5c---16627675881.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/lixokemofatenonafafafuv.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/u5cnvpntmmmbgrnn459j5qm5lr/vajikapufuvog.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/853209224a373f9e224038d4d5b4c142/gupisinolazozaxasozokole.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b2b49dfe7---jomumivosufatalakokugo.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/75752642400.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/vuwonorefoluwag.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607dae5b66119---teruvokolapokogam.pdfIn PDF document text
    • http://plncse.hu/php_data/file/83210741461.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/1a0e6820b2e78841dfe5926db265f03f/tilerepiwatufa.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c665207f6f5---jevafunawuwo.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c88bec688b6---70303263515.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/183cd6a85fbc61570f49c53e57fd5c34/baxupapalilutogizuwugi.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/5092263711.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/samikut.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/fidakogifa.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/o1bt3u3npu75ib7t98pu0f6as1/kitunofebosujijiluxebedat.pdfIn PDF document text
    • https://museos.comarcadelasierradealbarracin.es/ckfinder/userfiles/files/daludanoretobamegid.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607754cb368e0---86049339709.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/kuxebemagukabizovoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=american+headway+third+edition+workbook+answer+keyPDF link annotation
    • 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_off000165a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165A0 11000 bytes
SHA-256: ffdafeadde662cb40f2a270818cd2be888d3509e059cc75aa8cd436de71a859d
font_01_sfnt_off00017f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001972a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1972A 20544 bytes
SHA-256: a15f3d016dcf325b867e219fac11856991fe25cd42ef7dad69a7ead903ce91f3

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