Malicious PDF — malware analysis report

Static analysis result for SHA-256 d05a7dce12edd22a…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 07:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9797066452780eebb875ea368c23115d SHA-1: 7472fc58cea3d8c452da7f5a54da1e43f5c57259 SHA-256: d05a7dce12edd22a69e83f7a0fc7ab7d23641e4f1a8a75e4a1ecffb904d7c14c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous external URLs, several of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://yucehukuk.com/resimler/files/99178793360.pdf In PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/23982369343.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161340ed52c676---13111093029.pdfIn PDF document text
    • https://svltv.in/userfiles/files/xowinebok.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/genixitexizukabi.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/gitojirovotewivu.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/38282803192.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/67776622222.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/32068950050.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ea032c1ad75aa9a8513747aaddc98b90/vilapomepirowi.pdfIn PDF document text
    • http://com123.vn/uploads/file/pizoxerivimubaraw.pdfIn PDF document text
    • http://topflexsports.com/uploads/zekodi.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613076df9f035---80599953097.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/bezuvejane.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/78472319003.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/nuvonodulakagevurekeva.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/jobajozujozap.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/korivigaruvok.pdfIn PDF document text
    • https://korankertas.com/contents/files/sawegotuvitodeza.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/pokejosunovi.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/sitowixisufap.pdfIn PDF document text
    • http://linker-apps.com/files/koxalawubemofukefoge.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/22233334464.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/24254415466.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=gta+5+apk+obb+dataPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e114.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE114 18164 bytes
SHA-256: 750e8a2471276bafb91a098f6120492b26c1db3dd5cce9082425c3b5149af0d0
font_00_sfnt_off0000b732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB732 16308 bytes
SHA-256: f7e5d98071bf6ece7689b8bee2801a4713513bb55c3402fe08a779a5e2147519
font_02_sfnt_off0000fd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001154e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154E 10148 bytes
SHA-256: daecf666c61092ae63cae261c012b15b46fff6f49bd87ce98cd1192eea4fa226

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