Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f22fe19f7e4822…

MALICIOUS

PDF

85.1 KB Created: 2021-07-01 13:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86e5bb0c17b6517fed919dc08bc1898e SHA-1: ea039239f2a5ae45cf76ed08d1c9cea6ef18b359 SHA-256: 16f22fe19f7e4822b7296ff8f27c58d58f8cf14bf89392f2154a84e051e82ff5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains a high number of external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to exploit user interaction via embedded links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://alkanboya.com/files/file///lojunile.pdf In PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/1afac8d2488baddab8264dee55dd45c6/89321729922.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/bamebi.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aed5113abcf---3366790634.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089288b23a5f---dufulojabones.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/21834060112.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9700b6a11---6180023945.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/mefutolatagedukewobip.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16081a0d1b49ae---86045073575.pdfIn PDF document text
    • https://ocw.tw/uploads/files/32059034537.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c96e18ee29---niferivifunewuxu.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/66719172778.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/wopijerawedurivoredumumo.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/71839248496.pdfIn PDF document text
    • http://sun-tes.ru/files/file/xixijozasodufufunanem.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/86ca820a4eac6f6c119f7090183b96ca/xalatul.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/forugunokuv.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd89504c315---6591230223.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/20962756299.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade90ee5c0a---kagadufunijigesegonitenul.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/49623927062.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/zojalewor.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bac07886cb---mekowijufisakiwatuzezow.pdfIn PDF document text
    • http://klefmarken.se/upload/file/furexiruzokafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+new+maps+in+mario+kart+wiiPDF 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_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 10720 bytes
SHA-256: 0012b1a74d72e82eb5287ce7d6fea9d23af5ffbdc154351cd74282dbf3a42f00
font_01_sfnt_off00010338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10338 16804 bytes
SHA-256: e62540c3d8624d63bb718df2ca012b6348d912a6e0b44cd2a97968b8aee0f3ab
font_02_sfnt_off00012eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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