Malicious PDF — malware analysis report

Static analysis result for SHA-256 d759afc9901c8f97…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 11:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d9a25fe00f41718bc4bbc8954c174deb SHA-1: 46be0db2c1bf7936ea4c86c2124dbbedbdd22ca5 SHA-256: d759afc9901c8f9799cf7ba394efc36993225620aa9b85858daecbd3043e6b0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and other suspicious URLs. The presence of numerous external URIs and link farm indicators suggests the primary goal is to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=analysis+of+lucky%27s+speech+in+waiting+for+godot+pdf PDF link annotation
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d7b10f876e86b7f91c01be182e7f4cb9/kosolatafe.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/tazedaxigepuborowetudoju.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079f2dc43419---2603954430.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/wavukogetefugotovizivi.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/29341717113.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109022316558822.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/18144145643.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/jesobupu.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/46912962765.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/kiliwaxetuxevup.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/74070680189.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/29893491671.pdfIn PDF document text
    • http://charivne.info/images/file/93466988304.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/cj54bh2u8v60abfgajrqc8go7h/zefamarovoxebexitule.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210825062721.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/83651950125.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161347700d68b2---75271470266.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/dufevebewunopuwikuju.pdfIn PDF document text
    • https://saam.vn/images/content/file/jetomefuguzevuba.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/bijisanomi.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/37aa15367d14248e05f157f927814ddb/mubifote.pdfIn PDF document text
    • 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_off0000db17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB17 11304 bytes
SHA-256: 9e196a4687306fbadf64af2407267ddd1e5093d8fc6c7d7f8bd4566e04469d06
font_01_sfnt_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 18032 bytes
SHA-256: 9d860690eb7ba59019132949d203eca94af27ec646f7541ddb8c042061134048
font_02_sfnt_off000124c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1