Malicious PDF — malware analysis report

Static analysis result for SHA-256 8409e4f791704994…

MALICIOUS

PDF

90.0 KB Created: 2021-07-13 21:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f561d08931b862518ad9902cf3843b68 SHA-1: fbbc9bd2f40aff51deeadb48f3df0cac765f5bcb SHA-256: 8409e4f7917049948a29eb638e4c6e5d890c4eb022b379469472cbbb662e0b4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL analysis point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c532d97d55a---52148324867.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f0a88e65ae2c1697e549b1be67a576f4/25377706703.pdf
    • https://rotterdampools.com/contents//files/32086827860.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc3e9346f---8159910194.pdf
    • http://bruisedreedfoundation.org/clients/4/4d/4d9d7eec3bf3a09fa0457ace138f6a4e/File/bezenanilizijunimijazufe.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082638eac19c---28779481534.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/muxitovobakigewowuxosi.pdf
    • https://dijitalsanat.link/upload/files/99428574960.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/cdnv559rebl3u7siql8q7591sf/tabeduxapudas.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788432b13e0---fosasegivo.pdf
    • https://jdrum-music.com/uploads/ckfiles/files/45804220755.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a96db5ef5a2---19293824569.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adecde41719---jelenijafupedixuzur.pdf
    • http://straub-online.ch/userfiles/files/72640680313.pdf
    • http://hutbephottaihaiphong24h.com/upload/files/xajoz.pdf
    • https://swift-tw.com/lcc/upload/files/9138727236.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/20322416047.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb509bcd7db---sasexevesijupokixo.pdf
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/87787560738.pdf
    • https://kingwaterpure.com/ckfinder/userfiles/files/pekut.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfd4c64e4e---kotuxitimewojavivokoxax.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f21719da42---69624339922.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=core+strength+meaning
    • 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_off0000f652.bin
1ed5a30eaf478388407a4e4e99fa83704b4ec72ceaf70aaca7101c5926a15f8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 20528 bytes
font_01_sfnt_off00012b1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1D 16792 bytes
font_02_sfnt_off00014334.bin
3f2c1c735cc0f359ebdd88088487ccdb270d6964fa86a5298e96bd5c35877031
pdf-font-stream PDF embedded font (sfnt) at offset 0x14334 10540 bytes