Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a75274440778fd7…

MALICIOUS

PDF

86.7 KB Created: 2021-06-30 04:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28eff9e73204e9bad15bae38788662e5 SHA-1: ac2c34d7b314b07cfcfa4eeb9579411c734ef06a SHA-256: 5a75274440778fd7369d2ede6989167f5b77e0b1898f5f6431c0601673e7699c
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=shadow+of+the+titanic
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608a67f30cd21---79931425879.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/sk8g2rn6r77plhk54ien00g05o/pawaxidaseke.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801b9bb84ee---sapux.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0cff67379---3307243275.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1326deec7---19034791614.pdf
    • https://rdsdealers.com/ckfinder/userfiles/files/nawawiramategagufoboxudaw.pdf
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/97824222694.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b351081ca7---39147221103.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b2facb4b8---79134418531.pdf
    • http://maristaslardero.es/userfiles/file/21858160180.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c83700c36---jusezisilijujivobaxaga.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/3eee93162508a4c598c3bdba3d82e187/63062855511.pdf
    • http://flygarfield.net/userfiles/file/38172367548.pdf
    • http://anandtouristcorporation.com/uploads/90620757484.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e014b529e7---tezafugilipaxu.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6bd3a62cd---kosujikikanolawudo.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/90926235091.pdf
    • http://fixafilm.se/userfiles/file/wibosotaxitodozubozawavok.pdf
    • http://top1np.com/ckfinder/userfiles/files/23843530669.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed4357a8e4---sufimegeki.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5fe0b6314---91610455114.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/10r6h94763fbddt1f834f3m0ft/fevanusimupenodovuwopagoj.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/ebf54da41d84b6be67f0789e9ca94afa/bipepefa.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c88008d0548---xumufu.pdf
    • 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_off0000ef8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 16792 bytes
font_01_sfnt_off000107a4.bin
569e0390d23fe3e436b8fc784c2ff859e9185664c2e59ca5b1040224e8af4fdf
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 10420 bytes
font_02_sfnt_off00011f48.bin
318420c5f56de1f2ee70ff307de4f3690a4f9888a7dd034ca308e1aa42f3f1e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F48 17700 bytes