Malicious PDF — malware analysis report

Static analysis result for SHA-256 815bea24a5fa18bd…

MALICIOUS

PDF

89.0 KB Created: 2021-08-06 15:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e772a1c4e3a164c2e6d080a92518051d SHA-1: 38a3665daba78d389c320efa9ac6050a3783b56b SHA-256: 815bea24a5fa18bd52a195f59d506c9320d713daab78d61b18bbb0f9da3f9bb1
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 for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm or phishing lure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://gpszone.hu/upload/userfiles/file/55991101929.pdf
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/vapuwexowebasu.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f90d10f873d6ea5c4ec71d23fa015fe2/31674647785.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160701942a3f2b---79450952523.pdf
    • http://cooper1972.com/clients/b/b4/b451ebb09e7e0345645526f893d9a49e/File/66017658346.pdf
    • https://nilsahost.com/calisma2/files/uploads/31502650707.pdf
    • https://sharenkon.com/files/wemiz.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a968b64d7d---lojapejoxigiwoxez.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dd4304e76---9308194232.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/441dbced1bd6792e59802e7b0a3a9bae/7931019692.pdf
    • http://wallsfamilyreunion.com/clients/876683/File/42409108664.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f233e2cf48---98775480808.pdf
    • http://architects-desk.com/uploadsfile/kopozuzetoloxinidesizo.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104116bf22aa---mowafulokikiligolozez.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/6l3cb7hroh13pp0f6ncd4nihi2/zudavonitaririje.pdf
    • http://eventechsite.com/files/files/gisarotomisunijinonija.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/45a8d36baf7155eb9f89d0723fff0eb7/jarudekenatexo.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7db11e4521---8386167297.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607119d3df2cc---mukit.pdf
    • http://boldino-hotel.com/ckfinder/userfiles/files/mevij.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/tipuwosume.pdf
    • https://aspaeng.com/files/image/files/37060416109.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/f0846si3ov62k5ljlfqnqtc3cu/48468378628.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/0a64b839b6dfdae8507b138bdcbe917f/kafixe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=what+is+the+cliffhanger+in+chapter+2+of+the+giver
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4ba3a0bf5e080c36943a5fc876c675eb/rikogud.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_off0000f869.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 16792 bytes
font_01_sfnt_off00011080.bin
3a28f11d61b659deafa11b793f3db50439257a49a1cc2cbd12d5798410eab2fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x11080 10936 bytes
font_02_sfnt_off000129d9.bin
1618c3c65ed0d924d588ce7495e9cdf2f7b09f2bbebdcadb1afd8ff715a74316
pdf-font-stream PDF embedded font (sfnt) at offset 0x129D9 16664 bytes