Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c615b36d4020fea…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 12:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e85a1e3ff8268deddfbed34ee93ffc72 SHA-1: d802e08d19478ed3694d021d80f145fc09ac9306 SHA-256: 3c615b36d4020fea30e6b2b3250e5bcdc0683b9c8d1878277f3487f9a580fe1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links, increasing the chances of a user clicking on a malicious one.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://oniceh.ru/uplcv?utm_term=play+fallout+1+on+android PDF link annotation
    • https://ngonluathan.vn/images/ckeditor/files/fatutusivumujo.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210910044325_sc20ph.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/jakux.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/nizufe.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/69455507498.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/ginelifogedogibobew.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/59697517416.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/dodifumapoza.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/tejebevumususoduge.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/bupevibaxonanebab.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/lativojekexe.pdfIn PDF document text
    • https://ptogel2.com/contents/files/25703298503.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2ba3bb9c857822fae348520a056be988/64070918429.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/vumudidi.pdfIn PDF document text
    • http://usmleworkout.com/files/file/sigamovizo.pdfIn PDF document text
    • http://moristas.com/userfiles/files/javiw.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/a9a9tuql49lr2vimhv2jq4gn23/doxurexidizido.pdfIn PDF document text
    • https://phoneeucom.zabolekarburgas.com/userfiles/file/xejudakixalaku.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/54911204243.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/85813349342.pdfIn PDF document text
    • https://mihalex.by/files/files/6667962118.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/powefebemodisisoludemosi.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/50096133997.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/h0vpr3ug7cbi2qv1jl0cue7233/wugukidabuku.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0B 20444 bytes
SHA-256: 929527e058bd9dc1553ac8d04e1c77908136065586ef6e1a7d72e4f972555a1d
font_01_sfnt_off000113c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C2 10312 bytes
SHA-256: 807115e6dea7077e770f7e5e878a84bf2e5056ef0ddd049ccae38aff49db409a
font_02_sfnt_off00012b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1