Malicious PDF — malware analysis report

Static analysis result for SHA-256 958dcc136095bde0…

MALICIOUS

PDF

89.6 KB Created: 2021-08-05 16:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0036f5a988de410e24d83f0b4ee20287 SHA-1: 37f1e8f758127bd2b5138e060db9521dcbde4796 SHA-256: 958dcc136095bde0c9d24f39ef4e0f875d51ddda10db3fa9f1c000b7a7e033bf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the link farm nature of the document is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://chcial.ru/uplcv?utm_term=weight+training+guide+pdf PDF link annotation
    • http://redigonda.it/userfiles/files/49536226899.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd1f36ba65---rosotuvuvu.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210610064145.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210728_13807F38DCB435A8.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/2efdd53f546ed34e21d05cb8c5ccf556/18462084505.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/59705044342.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608af5d9adac6---furixesanugubotibato.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/22546463928.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2aaa736ba---99536933474.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/zebofiniput.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/9787221079.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b25c05de4---rusamesofoxunimusizefej.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/tiwof.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9481e13965746c417bbea6c5083a9f4e/37105646463.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/pinikarabodefiserurifop.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/58350061648.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/mebizitaxo.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/7a957368c5addb0e69ad08e2f601043b/55689144926.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab72e1743a0---29216091151.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/pigizaxam.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/soxebesumerudise.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/20074055796.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/83691699100.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848cdcc33eb---43058786338.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_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 10536 bytes
SHA-256: f04619e1a50eb4058b19c558ef577358b0a42b20d0ff93009dc33cb45e0dee81
font_02_sfnt_off00012d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6E 16664 bytes
SHA-256: 4d9cc9a643053db72a8729c47b663c3c5e0138321af46e09e216e5ab2b687a32

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