Malicious PDF — malware analysis report

Static analysis result for SHA-256 da413779bcf14b95…

MALICIOUS

PDF

86.6 KB Created: 2021-09-08 21:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27754f063b34fd02f0bb140e12b8f9ea SHA-1: 20ddbe06c4da2d38d154f904c79f266d8d57f6f2 SHA-256: da413779bcf14b95cfc1d71db2fff2a875bfd6c48d86b031367ee4af86e4845a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The primary goal appears to be directing users to external malicious content, likely for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39758681206.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136c370c03e2---85803287689.pdf
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/89024827865.pdf
    • https://hotellemaritime.com/hotel/upload/files/91665537971.pdf
    • http://www.cavice.fi/tiedostot/files/ginezizulubadimularikona.pdf
    • https://cafemocion.com/userfiles/file/15973156316.pdf
    • http://playitdirect.ca/ckfinder/uploadfiles/files/69520333427.pdf
    • http://hmondo.com/userData/board/file/13039062887.pdf
    • http://cathugo-catamarans.de/res/wysiwyg/file/radisog.pdf
    • http://www.dkmodels.net/ckfinder/userfiles/files/zukijuzuwe.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/37137279052.pdf
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/kovenejafenab.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161302f127063d---zibolibaduxovijutaviwu.pdf
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/20156987172.pdf
    • http://goteneplast.se/files/images/file/6117696542.pdf
    • http://studio-orlandini.com/userfiles/files/51908644978.pdf
    • http://hicoweld.com/shop/fck_file/file/69810512262.pdf
    • https://fullprotec.com/ckfinder/userfiles/files/dejujuneveduzabem.pdf
    • http://ecohort.com/userfiles/files/narovavikexowugasiboz.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130205925c9d---35272287774.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/069f12f5fd5f0be2175a3fc8754cf4ba/22147489066.pdf
    • https://www.aaptuk.org/ckfinder/userfiles/files/viwedisipasarigadepu.pdf
    • http://fluitec.fr/ressource/site-image/files/piwuxidubuwodutebepugixe.pdf
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/340360835.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=culturismo+sin+tonterias+dieta+pdf
    • https://www.thc.gda.pl/ckfinder/userfiles/files/tegazemidamig.pdf
    • 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_off0000e8b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 16792 bytes
font_01_sfnt_off000100cb.bin
c2f0e4794535ee80c42e3f4f7fde91deecf67b41db92d45137562c8e330374d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 10788 bytes
font_02_sfnt_off000119a0.bin
47a46fa15b0370a9a609f29d0c7bf5e3105fd1e7e972b65106559ecadc423a29
pdf-font-stream PDF embedded font (sfnt) at offset 0x119A0 19036 bytes