Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc397bf5378b392…

MALICIOUS

PDF

99.6 KB Created: 2021-07-08 07:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 584b6f8fab3efde20bd358e2fa4e7708 SHA-1: c13a4af58874c6e84a0df4372d0732732479469c SHA-256: 9dc397bf5378b392b9cfb28b646524189485bc936dc41e78e65f98953033caa1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests the document's purpose is to trick the user into downloading a password-protected archive, which is a common technique for evading initial security scans. The numerous links to compromised WordPress sites and disposable hosting further support this, as they likely serve as distribution points for the secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095dbcd51051---rakilimudanuwaw.pdf
    • http://nwatchonline.net/userfiles/file/53363481991.pdf
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/50622251635.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/0d3dbde4eee1bee8e3fd326c3156e794/920937599.pdf
    • http://conblocmanado.com/pics/file/83674950870.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608700974595a---6130179356.pdf
    • http://com123.vn/uploads/file/19513671787.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/bomazat.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c6ba03645---71832888239.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074629b5a805---xadoralomele.pdf
    • https://safrano.pl/userfiles/file/48402717107.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a171524c11---likubijexode.pdf
    • http://goldnumber.info/userfiles/file/jexagisil.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d49f3388e---xapoduloda.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160863a8589266---sopurop.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1902860c2d---tuzugotafaval.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607448d391d4c---24569319962.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/73d8b06a857b0fe310ca0e5eb30c4725/82070876577.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6266be8c---tezipesevexe.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/11653858856098aa621c786.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/pijumugubofinura.pdf
    • http://ruben.pl/ckfinder/userfiles/files/bodasuwegelolun.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/51e62ba37353113cc923309f3e888779/10821562859.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/d89s1494rm7lkqak1i5oso8bo9/nuwiwabuj.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16080a92c420db---wesimamufojogiduweziroxu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mig+welding+uses+which+type+of+electrode
    • 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_off00011f63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F63 16792 bytes
font_01_sfnt_off00013775.bin
71fb20296105040363f89e3b333476c9009f2a33d349beca5cdf70d9bf5d798d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13775 18204 bytes
font_02_sfnt_off00016765.bin
f4dfc5cba8aa91e868b90267b3095cebd0054a1019e42829ba5cc9bb1e25e517
pdf-font-stream PDF embedded font (sfnt) at offset 0x16765 11032 bytes