Malicious PDF — malware analysis report

Static analysis result for SHA-256 5684c48011f16639…

MALICIOUS

PDF

78.2 KB Created: 2021-09-03 07:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6418f874a69fa647489ff29d8cca9c37 SHA-1: bd790eade883c445350c388dec205af05bd3e48e SHA-256: 5684c48011f166396fb9edb75465b58a662ab0aa05cac32d853863b8c6391a2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple disposable hosting sites, suggesting an attempt to distribute malicious content or phish for information. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd56a1cfe7---93653191620.pdf In PDF document text
    • http://ediljolli.com/userfiles/files/zopufi.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/11cc6ebf4b43a10a66701daf0c6d61ac/44629991840.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/71803796799.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16079796dc570d---tirofozid.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/wiruregeme.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/xegarana.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072662294ee5---98925639603.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8c39821c4eedea5f20b4eb86c5787121/vupitusep.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/judafuku.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/67708185942.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/8affd43127a753c3e3f3e30357874ac7/6114684963.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/318e4e882c65940f91110d2b4db78094/95039644302.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/99169218029.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b4b5d7481a444a5f1b4078bdf4c00d78/70242104799.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7849cb6fe4250f5e814b454261181e54/84961556038.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/874021b3905ec4855c5e3065a85dcfc5/48189763846.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca7a359cbe---73353457205.pdfIn PDF document text
    • https://dukupahit.com/contents/files/12737164100.pdfIn PDF document text
    • https://mlspoland.co/files/file/30920762244.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/9172593318.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608523f0df6e1---lowojo.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/fuxepekagewale.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/4272295951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+beatles+let+it+be+sheet+music+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_off0000cd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD72 10764 bytes
SHA-256: 7e746f876a383bd1d0ae0027948932c8daf196a252d1374e22a8f4826d205105
font_01_sfnt_off0000e5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FE 17200 bytes
SHA-256: e440f82f3fa399b1171f925c69602102250c72bc8f7a8b913e5f125524003898
font_02_sfnt_off00011289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1