Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdaaf666c8b6e86f…

MALICIOUS

PDF

79.9 KB Created: 2021-09-01 04:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7dd7d87117e2e88655199e03d04e7c72 SHA-1: 210f0fbaca982c4b74f1986de95e036661938eb2 SHA-256: fdaaf666c8b6e86f39f77f0f6ed03587f88739dc0dddd900b4f31d1a4114bd9b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/61827683997.pdf In PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfca79156a---63966368023.pdfIn PDF document text
    • http://haphadoor.com/upload/files/toputalozaluv.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/1151c3c725e51913caf6dffd7fab04d3/moluxal.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/sakapin.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d3eaea985e2b59bd135c7369f7061bad/9903839714.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/47819250375.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/8e2fdb9a3bac476f7bc7905d909af40f/50999639727.pdfIn PDF document text
    • http://bettekingproductions.com/clients/874300/File/17758432075.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/suxepatuba.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c34fd934cad---bibubedirewetololuxiwa.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1621342881.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/181df4fdb903d0fb56c05282f08078f9/25264709479.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/p9fcdo6ge21kdp2ofjsiaelbig/larowojitegepawajidokerix.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/91535736821.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/53806348072.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/fugunopixunuz.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609baaae8613a---15691260596.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607add0f67c91---jepugi.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/46538441522.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160bd600009640---52826708780.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/xunotuneze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=gd%26t+statistical+tolerancePDF 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_off0000d765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD765 18104 bytes
SHA-256: 740f95040acb6512d8a994590604a6aa0e84de4ec01a59235cc1ab50c193eafe
font_01_sfnt_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E87 9252 bytes
SHA-256: 78cdcad42cdd225bb93e0ab49b11953281bf332d9afcbcac27717ef38fa03627

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