Malicious PDF — malware analysis report

Static analysis result for SHA-256 2422216cc8bf3949…

MALICIOUS

PDF

101.7 KB Created: 2021-07-30 16:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 5f12ad572d86f42a169cf783ab73b1eb SHA-1: 791d743b77002bc59edd04371214420767b27c05 SHA-256: 2422216cc8bf3949c0b00abf02955fed0d139d0c9cde65c6f2db2e2f0e98e80f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised websites, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

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 https://vegas-shop.net/uploads/files/81785197364.pdf In PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/dobugajemogamawilizokipi.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/jisow.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/8068863234.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/1mmg5iotdjeld1i5o7tvlq6mb5/munerozutetamitowa.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210503193809227.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f523a2acb5---89322128454.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884445ab84d---93345792461.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/deteviralomu.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/derobipoj.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f0e17ca5a---zavuretutajogebutera.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6876632912edc6bcc8aadd96c24abe5b/26141775230.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/rovaxirelutuvugozikuxano.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c9e1816c4---10777566707.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/rarasaremoto.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/nmm59e7ss3t6rc7oo3f0o3dcs7/31924658253.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/40896690588.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/rejakekuji.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e57a40d7c7a---41679475357.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8e92fb1f53d2cad1f8f1eda62634d339/21485348550.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dd6a63b6e---vavimilad.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e223aee49---wufifadenor.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/5662980147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=business+statistics+with+mystatlab+donnelly+2nd+editionPDF 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_off0001252f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252F 18528 bytes
SHA-256: 0ed5f23437b97763c9ef2744f2aa3a5a68ac83fbab7b0dacdee9ae69beb5a044
font_01_sfnt_off0001560f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1560F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E26 11148 bytes
SHA-256: fc4473edfaf2988bd05e633894b479cefff5fb0d8ee507bf4155ca64ef76607b

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