Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d95036933cc7e0…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 12:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1cae9c1d555af56bea188f07ceb2ef7 SHA-1: 3999d070f649a8b033fb50ada6e00a48be6f8e74 SHA-256: 55d95036933cc7e00b809cdfdc3fd3dcbe6b6f4709c91193521bf5322b319828
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://toyteepee.com/uploadfiles/file/210629031438084886l2gmg6.pdf In PDF document text
    • https://acronimocostanzo.com/userfiles/file/11119527723.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/88963127519.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/23685210461.pdfIn PDF document text
    • http://protok.pro/upload/files/buvinonoke.pdfIn PDF document text
    • https://groupunsur3.com/contents//files/xojikuzef.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/guwokaji.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/wigolaruderifanalaj.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/50596800367.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/jekipugasopewozajovedep.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/gizisubimefubuwigavim.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4a9f51aaf---82250642030.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c08db690---73442248029.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/riruxozotobesomulu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074a0e752aff---zakokugotowagami.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/94292857699.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/gesisol.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/vivufijedati.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/deduli.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/75534490338.pdfIn PDF document text
    • https://sbufficio.it/file/tekajavog.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/gupobulasevujelotinunev.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5466e63680---10557175304.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/nopije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=amadeus+ticketing+system+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_off0000df5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 16160 bytes
SHA-256: f4358a29f08d8f6f49dc5dc81c1dc22c3ea52c113d0cc3bee5319f19a1bb2dcf
font_01_sfnt_off000108d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 10984 bytes
SHA-256: 763ceac63fded2df42ddbfc9a008d6ecb35f062902724e42230daf6f1ba6cb74
font_02_sfnt_off0001222f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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