Malicious PDF — malware analysis report

Static analysis result for SHA-256 accc4a75d3b02104…

MALICIOUS

PDF

91.4 KB Created: 2021-09-05 08:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ee730c8a75687f7b8a2ff06e4be2143 SHA-1: 473d5226730962ab7f8a45afaa59a61ea46558fd SHA-256: accc4a75d3b021046f5cf556c7a35043e751743b2f7a29e48cf51e279cea8724
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://samuiluxurytravel.com/Uploads/file/falitelosiruzapiluposove.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/bvehfmgq284repv5mbacn65me7/duzesoruj.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/225f4a8ebb9327217001fd32b509fc1d/14061612259.pdf
    • https://medicabg.com/uploads/wysiwyg/files/64103720212.pdf
    • http://babamoleskine.com/files/file/94955752528.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a31d44afefa---sivux.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160735a1c8f811---89595788376.pdf
    • http://csc025.com/userfiles/file/20210625210724_xglfnz.pdf
    • http://kientrucphatloc.com/upload/files/6900365054.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b1ebbe0f6---81684204768.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab102b191c295091ddd13937330373e4/90616826082.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609893c010594---47312139035.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/72832640885.pdf
    • http://manpukulivermore.com/uploads/files/65774061608.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/cab0b7613571c6685deaaaad3a3c074b/48749593706.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612587985a513---39964207090.pdf
    • https://khanikango.in/file/23080208404.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114f52fa285f---valeka.pdf
    • http://alphanaturehk.com/userfiles/file/rivuseta.pdf
    • https://srilangkapools.com/contents//files/kajewovanozeb.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/30ea6c52decf5dfd4e121bb77c21fd65/79380058328.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ejeo6chok5c31df3tounrsdm4f/bemulajatol.pdf
    • http://ifa-astrologie.de/userfiles/file/39013606416.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=%C3%A9tatisme+et+anarchie+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f25e.bin
defd2b44cc560eb6e013d58409759627a65cfc750da4195c1281b30b4c8c9bd9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF25E 23728 bytes
font_01_sfnt_off00012df1.bin
cdb63d205005a14f5009d38e8e85db6db9c3a19f13724b5aca59601bf70250c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF1 10720 bytes
font_02_sfnt_off00014654.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14654 16792 bytes