Malicious PDF — malware analysis report

Static analysis result for SHA-256 905e79144ca56237…

MALICIOUS

PDF

79.3 KB Created: 2021-09-19 21:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 177bf734c81f1e5ab2625e1d67de256d SHA-1: 5e07d08c9ad849fe9b6866ade6abc9d81ae0d1b0 SHA-256: 905e79144ca56237ccd884196e0640926617106f809e57dd4aac1932dd5aa9d0
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. Heuristics indicate this is a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the phishing/trojan classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe69b0c425---1389003798.pdf In PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c66862a2ca---40333461679.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/sefibasezusiwopezaporiruk.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/lafuwizimikiduk.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///vopisijeleruk.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/zaxipakolo.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/54162918618.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/gujus.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/jajosaruvarubigezazatij.pdfIn PDF document text
    • https://elemonbg.com/Files/File/10604277866.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///faganewekajizeb.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378f14ae0a6---37759990372.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/52992578724.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/xaxetajaru.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/jokobeniwubo.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/18932763838.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/54102922385.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/pevixekare.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141c7adaddc1---rituvejavivabevesoxolugil.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/98193840603.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/74793886928.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210904_8DCCDA3675CD86E3.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/99842374924.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109130643484894.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/gamaza.pdfIn PDF document text
    • http://bronia.org/userfiles/file/50134790085.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca855d09cd---vokulojixujikitewuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mvc+android+examplePDF link annotation
    • 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_off0000d4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 16728 bytes
SHA-256: 3daa06aaea03d81e02a62d145d01cf96ee910e47cb23dcfbb80384384ab4812e
font_02_sfnt_off000117f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 10572 bytes
SHA-256: 6b1ac1eccc42ff1a805ced7f4ddd58ed0b73639c18ffc1e73b99842170eacd48