Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa43770926da9a32…

MALICIOUS

PDF

87.6 KB Created: 2021-09-07 08:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed3afe04572861c7ab2d74f025704d9b SHA-1: f3bd17b77c0af2f8edbad472fb0cd74cfb551904 SHA-256: fa43770926da9a3293763fadd36af3d43e27d1485ce29a7533ad4fd46de1e10a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as a phishing trojan. It contains numerous links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://chaplains-camps.org/upload_picture/file/18716118916.pdf In PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/89a6917b20baec7f25bef6a55a960499/kemaripux.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210831114813.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/uivba3t3e99f8m125cin0il8i3/46538382138.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/63316753569.pdfIn PDF document text
    • http://didula.com/img/file/rexip.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/44107187215.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/16247208704.pdfIn PDF document text
    • http://effektfilm.de/files/file/97611176344.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/4e6a4902392e5ce6fd118ebc4a6d727b/92117383426.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e0ab0aea1---92114784056.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/58209419113.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/27194973179.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/76400710501.pdfIn PDF document text
    • http://artside.org/data/temp/file/60812514939.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/1136a9605de6315f9db645a510ef16fe/391464788.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/63300172786.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/vafewatavadulav.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/rixegopumogonodageb.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/birot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fce+speaking+sample+test+pdfPDF 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_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 17396 bytes
SHA-256: 35ea7a3edeaa8fd0ca1e077a2852b13838173166e570a0bde7b1c2675910bd3a
font_01_sfnt_off0001204f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204F 10812 bytes
SHA-256: 685addda9af7c030e4a6c43856f6a145cce6440fc68561d11a47ca0afbfc922d
font_02_sfnt_off0001390b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1