Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf82374779ff1ac…

MALICIOUS

PDF

87.6 KB Created: 2021-08-03 10:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a38dfc373c13e574978e8df183557fb5 SHA-1: d121bb4cdf78cec85b6705f1bbee32837266dd93 SHA-256: adf82374779ff1ac153618d2ae6e8bcc779a41d4e800264d36619e989d2c51ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised or disposable hosting. Heuristics indicate it functions as a link farm, likely to redirect users to malicious sites or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stromzeleny.cz/file/bilofupefesinenuredigex.pdf In PDF document text
    • https://onlinendttraining.net/files/jezabagerelepunevisubug.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/mijagivafawoze.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/pesisugudibapokox.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/87740651907.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16074509a335bd---10216126127.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/magiwu.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/nevejurake.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f634d84ee5---punagim.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/59722628750.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/jijoto.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/871e05df1dc3f3372bb972f6d6c1f6c3/94749518386.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c18ea463edb---faxiw.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cb79c9089---7348340124.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/depeno.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/mufegokigikoxuzuzukam.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607764135d709---fopukugem.pdfIn PDF document text
    • http://inistor.com/ufiles/files/bekoxejeneruraxeji.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3dd44fd77---dunufipapixerebaxidevumo.pdfIn PDF document text
    • https://doganagolosa.it/file/sibix.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8844cd89b2---navimisutisidakaxefojinon.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/beletifov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+write+a+short+notice+resignation+letterPDF 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_off0000f284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF284 18228 bytes
SHA-256: eb53340486577610b81f4af033e345640d01c800619221ccbbc0fa6fdd436cec
font_01_sfnt_off00011ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001380b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380B 10588 bytes
SHA-256: 3c1f0783c865687f3a30afd43e1ed98af540c9d63ec05b4935c76360a8dca33d

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