Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e981318c90a7048…

MALICIOUS

PDF

95.3 KB Created: 2021-07-14 08:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 100c166bf07588dd32afc70d0acfb867 SHA-1: ca46f3371e6195a6905c04ed78734b27dffd92fb SHA-256: 1e981318c90a7048974561847e62e7cfbc17767fc83c6d6089aea9d5c85890b1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c440d06df8---59265987074.pdf In PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16088448a620fe---89935572965.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/zamezelezibub.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/9d93d832eda48448e49f99c39cc85586/32379792225.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae07c7c955---81461408487.pdfIn PDF document text
    • http://accronline.com/userfiles/file/lonitabenipobebep.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/supev.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1a5beffc8c2419e68420c80ee65f5808/22026941576.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/176df5129e365f5132110a5d95afbd07/safixipoxatogo.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05f2ab5e69---86660983042.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/siwemero.pdfIn PDF document text
    • http://dongsachhanoi.com/webroot/img/files/61674829956.pdfIn PDF document text
    • http://954move.com/clients/4890/File/70867188812.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1654a6de7---gawezunukasofadupibofa.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/tubalitip.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/faxekerafekufemipajifigo.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/efdc1eccf6fd46361fd557cac0d04803/80956462317.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/88500881287.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/xoruludodubopar.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a7493c676---20017018233.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf0dae559---dagapuzisavumebogofaf.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/tugojagajotafodapuv.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160cd86b95b892---kajogaxodejojaxugo.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2bd542bf---46666766625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hospitality+industry+trade+unionsPDF 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_off00011029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11029 10592 bytes
SHA-256: 5d5f7c6513fe3fa1d139499d90fb8ee568dde16c19fc89cdd372833c663ae09a
font_01_sfnt_off00012874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14086 18276 bytes
SHA-256: 94cf697ea6fcf6adf618db35a91618d3798cd3205fd2d05aa167fbed6c04ee70