Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31f38725c942445…

MALICIOUS

PDF

93.3 KB Created: 2021-08-19 06:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 354c6259fec3e9cd052e549940631472 SHA-1: 66b7a7eadb65ef534b63e56c084f38f13cc3b024 SHA-256: a31f38725c94244572221be05a9c72ac43a2614b3b9b26f035c07c50d3f41983
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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 http://urgentcarepb.net/userfiles/file/tanepajanefakezado.pdf
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/tepefogarabatuxobesezig.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/34e21514daf178fea24a1a14c270692f/52575967209.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160785825c1ed1---30843947759.pdf
    • http://icltindia.in/userfiles/file/ropijirim.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b20dd75dc56---99225400561.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/562734b27e86217ec0424eafb8c138b7/favigupege.pdf
    • http://africa-emergence2019.com/userfiles/file/vevafa.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d760d8ac494---gopirijikegudir.pdf
    • https://csn-alliance.com/data/files/54899464292.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b26260d86e1---17292092762.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089cc3681fc9---zibubelo.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607552ede4651---69738136840.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/leris.pdf
    • http://ipmarketing.net/userfiles/file/mupuk.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16119cc341b923---daborezuzolewebafedojeb.pdf
    • https://oumkua.com/userfiles/file/pevodanazebogarevugasex.pdf
    • http://stolizstekla.ru/userfiles/file/13687484465.pdf
    • http://tinhdaurosa.com/Images_upload/files/27115476765.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b76b2a53071---juvizadepunokejafosoxutal.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/91bc055d31d2ad15086923fc468af6a2/54874164632.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/fmo340f48k1jcu5p9k0ar7bqi5/xewujiraneluzopu.pdf
    • https://dusunceokulu.net/resimler/files/taxorijurafeforupodiwabob.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/191f3330379e3c321d194ffe102b2a6e/rigaguganutakukomoxalate.pdf
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34944032972.pdf
    • https://spiuruguay.com/ckfinder/userfiles/files/pimojuxavefubitepaludi.pdf
    • https://cvsc.co/userfiles/file/vufesijo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=die+kleine+raupe+nimmersatt+bilder+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_off0001045a.bin
e63575d57804d8e6ec9d9daa5c4dec6e1757f488d00e78f1eed8971c49099c7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1045A 10872 bytes
font_01_sfnt_off00011d3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3F 16792 bytes
font_02_sfnt_off00013551.bin
b5eb956eca0eaa24917d8e831f7947975884cb7968ae44162ca3bd3ed14b1f84
pdf-font-stream PDF embedded font (sfnt) at offset 0x13551 18308 bytes