Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff1a8c6b7d4888c…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 02:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5463a1bf447319eb770917eb223b5fc0 SHA-1: 9dc390d2584cc170d7883a999569de759d6eff98 SHA-256: 1ff1a8c6b7d4888cfe4aa21f9cd8d6046c224590073afe2e3b324999058cf4f2
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 identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of multiple compromised CMS upload links and disposable hosting further indicates a phishing or malware distribution attempt.

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 https://allytemp.ru/uplcv?utm_term=shendeti+mendor+pdf PDF link annotation
    • https://alexandrapanayotou.com/web/images/static/file/98496972906.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/bexuvikikenunumozarer.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/lafibuwekuzab.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/359e54ed88433d016018bf7ed2e46207/85520928059.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/23029839507.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/917c9a5a0166d178bde1b7732048e799/31856243289.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b656a6d02a---72810155903.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/22077823334.pdfIn PDF document text
    • https://schmitz.cz/res/file/pivipofe.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2b0d288e4---mizozuxuvi.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/9080426423.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/cf3b92a1e5c79628f001ad5956121b8e/pugosuzeraz.pdfIn PDF document text
    • http://watch62.ru/files/files/kefosipamuwenagusejupago.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/42811615890.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mutavukovizepezusipaguvi.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/8c5ce49cda3a6a7c42c90308fdc8de67/71541644347.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/a512lo46ari00ucdf290p685k3/fixuguzutokafa.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/9839045446a9a916aa07a12d8a2e14fc/rogamopesilud.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/89794786681.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/8u7mrib0k1a6koj5bfncoffep1/34540339232.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/lbf9gi7b639s8u8hts5q0m1ks2/16143286722.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/47651322848.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e29a30eb28b---dobegigedeporivigobokep.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210831152719_47982565.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-7-30/20210730041555327619.pdfIn PDF document text
    • 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_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 18128 bytes
SHA-256: 17d3f56c9a64ca31c19e1e7e101f8a3bcd31d5c5e5cac57e5785f274156326e2
font_02_sfnt_off0001256a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256A 10464 bytes
SHA-256: f35c55540f3cd23b0c02d5a6969cd0e300415dc322a4f5ef78a0c1a67f01edd5