Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ee81c38c892d75…

MALICIOUS

PDF

90.7 KB Created: 2021-09-05 05:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f659074e238045c41528fcb0b9d3fdb1 SHA-1: bfac56a67778b65d3265388f2ae9318b3a6b5347 SHA-256: 92ee81c38c892d759ad9f08b9d254c932844fd7abb16f905aa1e576b0ec7cdd8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards an attack pattern involving redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce8f9c9d3b---wotabazopugeteti.pdf In PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2c35a8e72d079dcf1bf74b36438e21f4/28333476472.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc9644862e---rofemesusizunawavabij.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/53730262965.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/19708362172.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/65288524480.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/fonutituzevamavewuzesaju.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfb94d9773---20902351626.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/zejuvozi.pdfIn PDF document text
    • http://yuha.be/_files/file/3866644285.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/klf7cpbs1ns00jkc06f2ktk5o0/13775783256.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/93716466765.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5347205d1b195d4e348ff605299e571d/dufuxav.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/14600306343.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/4179885793.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160725243bd161---86485021950.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/056160294c0f93652bfa3aa5941baaf9/92022927241.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ac5a0b6fbdc635f2e99b9d4bee1841cb/mirakaz.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9813dc712---migaxagelagaxesalanuzit.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/672354092.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eea3906c6---42463888705.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9666655aec5331d61e7a1c3268fd3fa8/fimamupoletoxov.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/funeroserepemamajurusip.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/16778045898.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/f6oip313rf4apa22tqplabei86/54098196083.pdfIn PDF document text
    • https://bangkoksolarpower.com/syner_upload/images/files/16023064021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=simulink+tutorial+for+beginners+pdfPDF 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_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 19020 bytes
SHA-256: adade2b1a333d7868fb288d0c0992daae5ad871a65d5ecd1bebeed17c68edcf4
font_01_sfnt_off00012acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E4 11248 bytes
SHA-256: 1e3b49362ff4e8a12afaf9d7eae7f55b34043fef3867af662d98518c4613bac4

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