Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34bd4fa5f6c9c83…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 12:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 21c80173f237909f6c155f6fe02000bb SHA-1: 228063cd31b214c3747311bccc440b302fa16a52 SHA-256: d34bd4fa5f6c9c831227d01842a5c10a30d144e3b6590fd92d91d24ab764518a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=nda+previous+year+maths+question+paper+pdf PDF link annotation
    • http://studio-orlandini.com/userfiles/files/gubitumedefewudiwusu.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e38fd36d2---batorokiwonesanox.pdfIn PDF document text
    • http://kasargod.net/uploads/file/61775834949.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/e83lad2o63hvns4ba19migogn9/faranogefimitabaxaxox.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/mopoxugagiruvixuserefud.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ct2v2nk0sde479ml7rhbtkiuh5/12599426868.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/141817d81d45925a859225716bd78b93/90383667931.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/632b854b745a0445cd846c3241490b76/lugufobezigijegalojajafat.pdfIn PDF document text
    • http://intergeored.com/upload/File/18289159644.pdfIn PDF document text
    • https://digireg.se/upload/mofutabavakudedarovow.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/66995266171.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/laduwuxumiriginewumevotum.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/risororowibisegapen.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/15740791522.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/ridafiluwujasifawepa.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/86218795677.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/tfla917r8a14t74rc2h0kpkkho/71336816602.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d84a54d1d00---11108363478.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/vofujifisoroseku.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/sepawopov.pdfIn PDF document text
    • http://asfalon.com/__files/file/nupofugekojudu.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/89081765709.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089d2c1b9154---33395614172.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612a6131e794c---38492481154.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/74287478241.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_off0000e4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 17336 bytes
SHA-256: aa087e2984c1e2897bd661c15a17d0c10ae6ed7d2c9ff346d2f0afe33ee0b4a1
font_01_sfnt_off00011216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2D 11120 bytes
SHA-256: 9fa7fa8f3a8d9631b50df628d69c7bf56e969e41d58f263434568fa303eca60c