Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6614349ade2bc25…

MALICIOUS

PDF

75.1 KB Created: 2021-09-18 14:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f58cd7b0af7e87cfcbcdb3988b80c2b SHA-1: e182ddae513f2b1641c480379899b21bf740116d SHA-256: e6614349ade2bc25b1a611de855b17406c52af34ae85a26685b15d74ce799de3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly supports this attack pattern. No scripts were extracted, but the document's structure and embedded links are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://avanti.pl/userfiles/file/tudanumise.pdf In PDF document text
    • http://shbaicun.com/userfiles/file/2021090508474473499.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/33339076010.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ab82a410ec825f232376819e384cf86b/jumobezijomewavobopol.pdfIn PDF document text
    • http://ternovykh.ru/content/file/tozetulogepit.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/23680019408.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///28929244042.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/lfegqncdu4pkq7kp599n8kbpgc/sanudekenuzozinep.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/31291672540.pdfIn PDF document text
    • http://indexone.ru/upload/file/jobaperumapazu.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae38289663---mivenut.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wozukowazexisojat.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/xadoxolikaratije.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/kuwumunafibufijug.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/kawijamukogamuzexidizow.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/zofepamajotuvutivege.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/fidajid.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/58234513746.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109140304588867.pdfIn PDF document text
    • https://ripedesign.com/app/webroot/files/fckeditor/file/zetigotazixikemu.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/wunuvokewebosejelukazo.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/gutakesopiligu.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/33976132230.pdfIn PDF document text
    • http://www.bash.cl/media/file/95882496461.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/jujazadofebobimewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=download+via+android+appPDF 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_off0000c562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC562 10140 bytes
SHA-256: e307b53d1d8959cda54cbdcd6f94df5bd4adb15081eeda3b5a50f18b0a16f716
font_01_sfnt_off0000dc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 16568 bytes
SHA-256: 82c4b59d6f6b73622962eb8e194e7df75be9848b4888a82558cfd15d84163cf8
font_02_sfnt_off000106cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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