Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4db3c6f1d710cf…

MALICIOUS

PDF

78.7 KB Created: 2021-06-29 19:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0871e3f5b0c65f20c489826a2380e86 SHA-1: 572273b6db5d43fad5170a8b419563af1c8284ee SHA-256: 0a4db3c6f1d710cf62d0646ac4a40fe47be379f85970d46e450538a58b428d86
224 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document impersonates a cloud sharing service, likely to trick users into clicking the malicious links and downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d0a52e7a0---32511897760.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/ef5d0417f18563a7768d8b7b2cc8a965/tetipolubalosemigo.pdf
    • http://reguitti-engineering.it/userfiles/files/37550648886.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/l4515lufhpc4ch9svn52k7g8om/30144513615.pdf
    • http://canadanur.com/resimler/files/66807222660.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/g7fvrui13qihjmg5ajpu8392g4/xogoj.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/28daff0436eca3ebd1aa61b5690ec040/57696093285.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/xigorawogugil.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076ce4573cf6---didegorifewe.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/529e0c7a40e4720377ae6f7a8ac5aefb/6184048604.pdf
    • http://thementalhealthadvocates.org/files/userfiles/file/43701434120.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/91b83f119e5766bbae63e272e7ed7dcc/bugumogeruxavugibu.pdf
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/94749447347.pdf
    • http://lapenya.cat/imgjovesnaves/file/powizamigakijevi.pdf
    • http://www.gesas.it/media/mailinglist/file/7674623559.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/r4l51lc8h3cm7p4uc1oqun1shi/rigomodakoje.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/88d79be9c4b1df2201197d399fafbc31/80884655056.pdf
    • http://billedbutikken.dk/articlefiles/file/jaxujixaziwunopizun.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/2vhefoi65qprcu4doa5osuvvic/zavumovixenetur.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a9d11e9f---vibiwit.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/462940bb41de2d04fa8b0c50af23529d/demixapitetero.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bad6cd3b66aab4d0e6a3e81165178065/ravodunufegowukoruvikuk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+protect+pdf+file+from+copying+and+editing
    • 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_off0000d034.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD034 16792 bytes
font_01_sfnt_off0000e84b.bin
f2865fc7a157391bc00202220c865e5631e4e085f78e0c6dcc9a45c8bb9d7e77
pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 10984 bytes
font_02_sfnt_off00010193.bin
75f74a87e514685e38655e21a0b2c0271f02c07d934f2353d2ca1ba59856a7ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x10193 16708 bytes