Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54145f2aaaf4ba2…

MALICIOUS

PDF

156.8 KB Created: 2021-07-01 09:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1fbeb915028bbcfca604410304f60d8 SHA-1: cafab393622feff7e952ee22beee275044624cdb SHA-256: b54145f2aaaf4ba21eb7632e0ea9bb5328e95df351b9b9ee66559632acd817a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://inwebjor.ru/uplcv?utm_term=digestive+system+drawing
    • http://chiron-ventures.com/chiron/home/img/upload/files/210614194942041145m6r5f.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8cc212aac---topomivekozulajufaliv.pdf
    • https://la-klamm.org/userfiles/file/72309328515.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4f4ba5b3b---fenonuvenamenive.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160903ce4504c6---68289077489.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607336bf2fc27---rujamugifulatonupujuj.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26123a1819---30657123587.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/cabd4621eb4ac5a3b16c3474e952b294/15979647948.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d432ee9af5---digenekanekex.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c89f5586e66---dupiduvopabumegadujaveniz.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080a4a161185---pimavisexili.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9041b94c11---vapakopukomedoki.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081073d1f098---37464092931.pdf
    • https://webornate.com/viking1/uploads/files/gukewobofimutolejiwa.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4deb09d5b---nisetutumudisepa.pdf
    • https://ktmcollege.org/public_html/userfiles/file/29327557111.pdf
    • https://flyingfish-stay.com/userfiles/file/69033914469.pdf
    • http://erfaspot.com/resimler/files/22586603463.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5620311daf---54015345922.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/86438192790.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/79689593620.pdf
    • https://hiperaktivite.info/userfiles/files/32586538176.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/890a3d61b78fd1b0f1a0a852efdb9499/30576828817.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160907128995a4---wonasa.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/padesemekugasijegitowe.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/ffab56d4c59d3e5cb91aad6b1ab9fa39/dutevudijakez.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_off00020583.bin
73e7ac48c2c1a57bdd15496aa96aa9893cfb158a188edb8fb88229c4682959d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20583 10692 bytes
font_01_sfnt_off00021de3.bin
f134320f216c5d98ed2cba8da43719e638b20d434c9b2aa63c7bc5e895afae62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21DE3 17428 bytes
font_02_sfnt_off00024b5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24B5C 16792 bytes

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