Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4298fb6366b36d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 07:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6cbbcc6e156a365a6d5c86a592adbcc SHA-1: 01beb49769e3be44f2279ecb2db91dfaaf622ad7 SHA-256: 8a4298fb6366b36dc999459087f685fcc8ceda22cb0a038dcda8291f82815a41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan indicate a high likelihood of malicious intent, possibly involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://veiligheidssloten.nl/ckfinder/userfiles/files/xitejebuziderem.pdf
    • http://sakem.org/userfiles/files/xosasiwatedotonudazerer.pdf
    • http://evola.it/userfiles/files/mumatakajokavugafixe.pdf
    • https://krantiservice.com/ckfinder/userfiles/files/nopojekoximuzuj.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/7877a9e6113aaf48108e9d2b1ea88aa7/15704494051.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/snodiuv46tmic6v5klrabcptcu/62923520554.pdf
    • http://lachina.cn/upload/file/65185726941.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/zaginurasidafaluv.pdf
    • https://inprovitperu.com/ckfinder/userfiles/files/11459693268.pdf
    • http://karthikeyanjayaram.in/userfiles/file/4365641931.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7fd61d1ef---82987667772.pdf
    • http://jump360.co/upload/files/20210902152650.pdf
    • http://travelshops.pl/userfiles/file/13103037349.pdf
    • http://landroverbh.com/ckfinder/userfiles/files/24467375109.pdf
    • https://relans-nn.ru/images/docs/file/pijidusuvorefoz.pdf
    • http://dxczx.com/ckfinder/userfiles/files/20210914_034301.pdf
    • https://triptoboloyfoundation.org/editorsfiles/files/74319706201.pdf
    • http://flyingkirin.com/uploadfiles/file/060625039058.pdf
    • http://restavratorstvo.com/ckfinder/userfiles/files/movawonol.pdf
    • http://tentauto23.ru/ckfinder/userfiles/files/tigigosojipuporalulepuk.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/3c4db2a1528ae3881d020f669f77de18/36150542429.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613419de9e2e2---pujuselovotudawexubokoj.pdf
    • http://archiw.gbpopatowiec.pl/img/upload/files/79969893820.pdf
    • http://heorungminhphat.com/luutru/files/74518826164.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+auto+reply+while+driving
    • 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_off0000d842.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 16792 bytes
font_01_sfnt_off0000f059.bin
2a9dde87d0341807524f66f8bd652d6fe424a4a8168bf489e5b22d7d10fc53c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 10848 bytes
font_02_sfnt_off0001092a.bin
38ce804d48f6734783b38ea9e29548975a6431cd7f0a30d316165a8618bd9bfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 18488 bytes