Malicious PDF — malware analysis report

Static analysis result for SHA-256 bffddecb23eb93d7…

MALICIOUS

PDF

97.5 KB Created: 2021-07-06 03:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 18586154d34d538ac79036c478fb6fbc SHA-1: 436e876a3c825bf4cef14d729edb77b3965081cc SHA-256: bffddecb23eb93d75f176c9305a8242d67607a80a8abcb6c56b4b9abd9f81039
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests it may be used to bypass gateway scanning by instructing the user to open a password-protected archive. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/d13b7c6d85d8f02ffd091cca90261250/jeliwonudolapa.pdf In PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87c55a1fd---11304899198.pdfIn PDF document text
    • https://dineflon.com//files/15062647306.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076225abe8c7---48566468161.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/57192209450.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/lidodarug.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021060216071794.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/va0g90bcglntppk3pf0tpgupbq/38901426687.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7fec1a1ef43e3e1e460fcd2a99ff7071/nelulosozo.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/76d2554d84ca661c72f36dfdb9d45b6c/bedemeg.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5ca63e23a---zulosaforuf.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd47003d7e---67102249435.pdfIn PDF document text
    • http://askort.pl/Upload/file/rexokoruvanexalinogafaj.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/99053572846.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/57568520923.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/f35c116a2d502fbd0ced1f8148ff9566/81241243704.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/81437764267.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4ae1b468f---32961172003.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94bccc2cf3---85775784602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=economics+class+9th+chapter+1+question+answerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CB 11172 bytes
SHA-256: 5741eaede39954a374313072f66c7f9944b2b0ed95e6c58216b62e4a040105e5
font_01_sfnt_off00011dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E0 16224 bytes
SHA-256: da79484a7f94e028a8871d907a282bdc2df095dfef79f7b1f2af1efeeab75da7
font_03_sfnt_off00014b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B81 16580 bytes
SHA-256: eaaabf830f221309ed9302289e5b09b0165830c3abcc13276a83cb8fa6790f1f

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