Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f32805fc111d5c0…

MALICIOUS

PDF

88.4 KB Created: 2021-07-04 15:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69f19b2ed7a15c78bfa4fc921bf834ce SHA-1: 5699ef5d343ac129fe59b4b480e1c4f2ce5bace3 SHA-256: 8f32805fc111d5c03f13153f2e1cab8ef32e100d280983a960e1d3e5028ff7f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://dalilak1.com/userfiles/file/36743859020.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b42bf99feb1---67032761612.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbee5e4b2e---xelod.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16092384606ca8---67320260332.pdf
    • http://deborahkay.com/ckfinder/userfiles/files/40672185425.pdf
    • http://ascensionchina.com/userfiles/file/wexezudajodepuralu.pdf
    • http://narcisse.sk/editor_uploads/files/52023969512.pdf
    • http://www.findvoters.com/userfiles/file/1855654529.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/74b6c8c8a70713b9cb852f25764949a8/51926442362.pdf
    • http://chukgoobok.com/files/fckeditor/file/92627432122.pdf
    • http://massageindex.nl/images/uploads/sasadinesajejoma.pdf
    • http://duda-tech.pl/dudatech/upload/file/dakizagulajij.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607518654b201---xenuzelonitipiw.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd95873de1---30745974575.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfa5d85b36---xumerijoka.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11327bebe2---93524524837.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ll6seh9odegs67hfe1ulk0oktt/54353159965.pdf
    • http://chinahongji.com/d/files/93960183888.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d223ae6bc9c3b6237c0357e6c2c71f64/50344715961.pdf
    • https://psychologgia.pl/Upload/file/lubosizedifewix.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607d873182cd7---kowutimid.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/ko35iefpapgvqugr18b3m9fv67/vafer.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160acb9e1a5127---fuponidisuguv.pdf
    • http://lamexmarket.com/uploads/files/51463257091.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=math+puzzles+for+adults+with+answers
    • 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_off0000f668.bin
3037ecb845147e1eafc6cf7d9e8e2a86507f48b38d6699e70f5e62e23ea35bdf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 10832 bytes
font_01_sfnt_off00010f72.bin
31cc95dd07915648684f5c3a4f74d290039773d7447356e43db85bde6bfb2400
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F72 17048 bytes
font_02_sfnt_off00013c12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C12 16792 bytes