Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a6f4cd28877a13…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 05:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c78022faa49655a645773e500e343be6 SHA-1: ee574833a8e95b4e2629d3512958eb4cb359211e SHA-256: 88a6f4cd28877a13127e7a664c08bb19a9bcf82169e12ed668052d913d039ce6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The file's structure as a link farm on potentially compromised infrastructure supports a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ent17fabfo5i0kvm0cnma8u931/livoratigugivifovonu.pdf
    • http://zamdq.com/filespath/files/20210915204125.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614799c60ca77---53154140880.pdf
    • https://www.aukuras.org/ckfinder/userfiles/files/2909533167.pdf
    • https://whiteplacard.com/UserFiles/file/tigudapogikif.pdf
    • http://upnbkk.com/file_media/file_image/file/18987116499.pdf
    • http://euroear.eu/ckfinder/userfiles/files/46992993671.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/371e52a5e9fa3397d9291b8d0256f2b4/62405866929.pdf
    • https://bawauang.com/contents/files/mudujawaf.pdf
    • https://shian-jin.com/UserFiles/files/jebuli.pdf
    • https://diamond-marketing.cz/soubory/kodelesotewariz.pdf
    • http://seattlebestteriyaki.com/uploads/files/75477580990.pdf
    • https://oilbasaro.com/web/images/ckfinder/files/20210912012719.pdf
    • http://usaoxin.com/userfiles/2021-9/file/bametunowuzaseruliraviza.pdf
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/pititiwomawisojitaser.pdf
    • http://altiro.nl/home/tjerk/file/ziroson.pdf
    • http://cuoredicane.it/userfiles/files/87304562721.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/734261edd4892baf2432beabb48c37b2/fojumojexav.pdf
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/11653107030.pdf
    • http://deshdunya.com/blogimage/file/kadilaguz.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2ce3c2f9c5e44452123db072ae686f89/jawidivati.pdf
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/dofiwosekenozewa.pdf
    • http://jingmingtai.com/filespath/files/20210905064345.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=female+buu+dragon+ball+fighterz
    • 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_off0000d9a2.bin
7d560a54d268cb5b63a041b8917cce6bd5b03d26a1d918e81b0f166d2fd9bf49
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A2 18564 bytes
font_01_sfnt_off00010a6f.bin
d87009deabb7f12e9048049d8f4fe9e9a59776c5bdbfc3fc8f5aee94d2a7e08c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 10908 bytes
font_02_sfnt_off00012330.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12330 16792 bytes