Malicious PDF — malware analysis report

Static analysis result for SHA-256 c759033862b99317…

MALICIOUS

PDF

84.2 KB Created: 2021-06-27 23:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d659e303a99aa74abe87f7eb0f77059 SHA-1: 2227ec9cd9593add91e7dfeb8866c66ead413eee SHA-256: c759033862b9931737fda4306343b41dd62dd622784e96ea4613275f831e5b87
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' further suggests that the document may be intended to trick users into downloading a password-protected archive, likely containing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://queure.ru/uplcv?utm_term=out+of+autoclave
    • http://voijin.com/userfiles/files/xonedukadusof.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607de368ac47a---74469260702.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/d647a545f4b87ada7a996d4f82ba5fe3/11887586765.pdf
    • http://unseenadventure.com/userfiles/file/bomotobawamadesegobabup.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/mitajojidotufobuxujiwevaz.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vgjj2ufjrjtv2ehlu733qjm1h5/xaroledi.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b54fcf8de---42569921218.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4cc147bfb120cbfb2547922f18a764e5/57270046042.pdf
    • http://nuraski.pl/wsg/userfiles/sajakisowobimoripadetovu.pdf
    • https://coonvalleycc.com/userfiles/file/muboduvug.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd55791cdec---xadusipateginiwexik.pdf
    • http://valaptop.com/ImagesVA/file/walaxanel.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/4p16umkfte9dg4knr3kdllfva3/tuwoxigusarujog.pdf
    • http://xboxheerlen.nl/userfiles/file/fosufidejuvezujuvuvafav.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36434ec65---7716515454.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7c81f081---zamurudeworumu.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cdc04d04c---dogarujavil.pdf
    • http://meyergarden.com/ckfinder/userfiles/files/dujolalorevofadalokodeval.pdf
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/murogatesizakapar.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c57366241---39846931872.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f897425199---19124279061.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/d3449d62a6fdbd04c1117d589901870f/91068607627.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/56082519186.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4fd895ba322ba6dd8839b57adcc7d82f/sinetakuxawi.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_off0000e64d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE64D 16792 bytes
font_01_sfnt_off0000fe64.bin
044d007b2773e0a408d2c4d371a551d321dc09039c38fc6e7b7ba3a3844dc30c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 10056 bytes
font_02_sfnt_off000114ff.bin
6dede5712ed211cfe056730f14119df7056b0af3dc06d7a3e7169360cd6a8144
pdf-font-stream PDF embedded font (sfnt) at offset 0x114FF 17828 bytes