Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8865230d0ee3bbb…

MALICIOUS

PDF

74.1 KB Created: 2021-09-01 12:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 568e33103ae2bb5701b80363d4855df1 SHA-1: f5c2408608feab5395f76696e5f3ab4803ae12d1 SHA-256: b8865230d0ee3bbb39d48b7ced2f58f6c880ecde82a45653f437c68d99977d75
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating an attempt to distribute malicious files. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b68e89ba99---vowuka.pdf In PDF document text
    • http://newdimension.su/userfiles/file/veritogu.pdfIn PDF document text
    • https://iltuosarto.com/file/60501174662.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/51682048614.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12dd1378f1---narukikofirifu.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/juxarivakarevo.pdfIn PDF document text
    • https://signika.pl/Upload/file/firabux.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/n1hqeicbdum5qvo3ndrf699dcg/jaxikiteg.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/i4g171fpn59b6i8ghdv28371qt/16106092781.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160949df191cd7---zogutijefivapulo.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/xelixirepu.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/lizinodowi.pdfIn PDF document text
    • http://c-amc.com/upload/files/tagepumuberamutepawer.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/xirozekiguduzenofol.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/zedoxuwi.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161056706522d6---vadidaraf.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/65699997869.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/1504820729.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/acntjeshq7u84uf2ae88gcd6a1/verubanakafefa.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/zupumovelovom.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/mefisefigixo.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076251487b25---sibekutu.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/vefelidawamesonaji.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/92479529410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=types+of+agricultural+practicesPDF 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_off0000c017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82E 10728 bytes
SHA-256: 9c4c97ad6d6c5da5783816862e373b00a0718eebab4ac1aa2674a2dcbff0cadf
font_02_sfnt_off0000f109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 16064 bytes
SHA-256: 5e54fbcb81063d63ad395b6e1200f3d15461c6ea94e33dc5ed99da0529864411