Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec3b2e95f78ecaf…

MALICIOUS

PDF

82.2 KB Created: 2021-08-09 23:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dbcdb530e6cbcd2fcdb9954c00a8dbd0 SHA-1: a5980442ee2c4f98638378fed7d4b4fc2d9f49d7 SHA-256: 8ec3b2e95f78ecafcbc25235e6182888b1b1b24b46d3b0e83e984de7239f5ab4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious PDF used as a lure, potentially for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • 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://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vh4r4m1pa21djukd13koauhev1/72310350594.pdf In PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/6aptvdjunt77s60su27hu4gai0/94563948839.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f832cc475---61714920383.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609488c7e0b1a---lobimumufa.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9fa88cd34---banutazajaxumasome.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/wipevologi.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/8dbosm5bva9a0muntljfj5mcgu/patopilurijeger.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/29856378335.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96899a12e8---9557268308.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/fususolabowikel.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/035327fa5acbc7639442124c0a6db72c/xaxawepupajuxaxudi.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/c972aed1b885e4984876b953e835d010/jatubojabifiwikawalu.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/6g0slo374e2nlp1tsdkkfqah8s/19747416389.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608257e62684d---japojeroxonegipumubo.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/sevurenosisinabidulof.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/xoduvasopugo.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/177ca0ae1250f5e559a0560313f78789/14300443770.pdfIn PDF document text
    • http://mid-europe-ex.com/65911736150.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/laluditogopetak.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/sodawago.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/xijagebekirosemabulezaz.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abfbf287a5---jojebabulaxofijiw.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/2747971450.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609022ee28ed6---ximovepusotinub.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/57839783083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=super+mario+kart+tour+twitterPDF 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_off0000ddc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC3 10448 bytes
SHA-256: c2d669d5d346bfcd282a516dcc585e12f0095cee4b6ba590677feb2175a5adb8
font_01_sfnt_off0000f593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 16920 bytes
SHA-256: 5997bfa63269d24bb75044c85412a80d2c837bd2b0823236fab45913e4e67a3e
font_02_sfnt_off00012201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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