Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0bc5297e086b3a…

MALICIOUS

PDF

93.3 KB Created: 2021-08-09 13:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52caea1679219986123ea7e2092bc6f7 SHA-1: 362bf32a903473b8d7f3d1eed32d7597a5b911a4 SHA-256: 2c0bc5297e086b3a3828816a18d5ce1cd9554e601a53a5ddb237272b045160e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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 https://careersourceokaloosawalton.com/files/public/fojokitaxogonofigerumuvix.pdf In PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a45f4a0e57abe05a458ecb08e9a2a49d/75063186697.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/67895728241.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9iita41efvqn9k84ghuqoe4d1q/jelazaradebesef.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/b9eb1af44abe5519470de3ee220ed146/10621686531.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16091f6729ed1a---basimidib.pdfIn PDF document text
    • https://memoservicesrl.it/file/24841863888.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e86ffc8784---wazal.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/p77g1coskduqbs1qkvqledrspo/nolijalisorinojawe.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/sumivupasovasawef.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/motalopetosaxozefibitupug.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c84c09ff5---97233299418.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af95b09df0---nikodorafotukexiruvidorat.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/salokifokuzomuwaw.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/lituzuvij.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f76e407e6---xikasonunupimexovapi.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210713_48FEEF5A3C4772D4.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/tebedawavedogiragep.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/25190999777.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b32316e4112---nebulexevexoxasikux.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6642d6b71---wunupiwiwumeseb.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/gowuga.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/dd477b71244683cb0403f74e1c682912/8949845484.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa54618ce6---64152581790.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/15639380940.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/oqu2627rtssa0b9ocoe01uust3/85733581194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hum+tum+2004+full+movie+dailymotion+part+1PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0D 16428 bytes
SHA-256: 8d3d6af0518000b08443f6d19d653346e534456d7729d8510d24044ce0702ae4
font_01_sfnt_off00010478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 11136 bytes
SHA-256: d80b940a818c8dc1950c59e1a6254730d408607578d95c7a13a7bf1f7fa1e5e6
font_02_sfnt_off00011e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7B 18656 bytes
SHA-256: 9accdc37bb069fb9b6b6222fe865008d7cdfc6bbe48dc3b2027846ed27ffdc54
font_03_sfnt_off00014e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1