Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9351cda629edcb8…

MALICIOUS

PDF

80.8 KB Created: 2021-09-20 16:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d63ca986026a94bae33be22a68d9c590 SHA-1: 35e3e88b843f657af01a10f43f9899de103564dd SHA-256: e9351cda629edcb8e0dbe5ed5e28977840db36529be19e759587950f1ae9dbee
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users away from the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/b28ba1de5e3371b4e2434f7f45980d30/69823915880.pdf
    • http://atomicattack.com/atomic/fckimages/file/mofixajikutenidisovisabi.pdf
    • https://at2-turbo-j3t.com/contents/files/76647311237.pdf
    • http://csc0516.com/userfiles/file/20210910113428_x03y18.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cef4a3270e---xijuxu.pdf
    • http://budgettranslation.hu/sites/default/files/file/tufodoniwijugonikili.pdf
    • http://airmon.hu/images/files/jopupoxiluweb.pdf
    • http://digitalpolicycouncil.com/imagenes/file/16973522310.pdf
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/nugipelawifereleriwit.pdf
    • http://mclarenquartz.in/ci/userfiles/files/54149977077.pdf
    • https://gestionarival.com/userfiles/file/28410389507.pdf
    • http://trunghungplastic.com/luutru/files/10948712680.pdf
    • http://electriccityusa.com/images/fck_uploads/file/23277610793.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138aeced9467---vinodejavuwenax.pdf
    • http://animationcoach.com/userfiles/file/relivatovi.pdf
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/20757726506.pdf
    • https://rheinfurth.de/userfiles/file/75439108105.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/91517459871.pdf
    • https://universal4shipping.net/userfiles/file/73033688165.pdf
    • http://climacom.eu/userfiles/files/devekemafunakerevejod.pdf
    • https://berettyotv.hu/userfiles/files/19150658283.pdf
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/94436180028.pdf
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/23384163386.pdf
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/muwilinuwadutudekenem.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=motion+photos+android
    • 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_off0000d870.bin
d3b5f0924b48627c46cde44ce89f2ad85f5d225a4933c17c88b893fb3c846966
pdf-font-stream PDF embedded font (sfnt) at offset 0xD870 10304 bytes
font_01_sfnt_off0000ef90.bin
c8d19ed919ac964c3cbc97c3e5211bebcf7228b7f4a784ceddde42b03f22d7ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 17420 bytes
font_02_sfnt_off00011d93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D93 16792 bytes