Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e86f63dfddc3580…

MALICIOUS

PDF

98.4 KB Created: 2021-09-04 22:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dce9b819dd0e2b2e6d2ceb455e127e6a SHA-1: fc1aa1c57eed95069d8fb70337699e144f8355c1 SHA-256: 0e86f63dfddc35802a563ab0db3ae1e7f09e8fa9231c7e8c65dde8751f61bd4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites. The document's structure and embedded links suggest an attempt to lure users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nwhouse.ru/uploads/file/noxezojapipon.pdf In PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/94951335622.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef699019a---14094669707.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/4306eae4bb86e7555d7a596b75db1cff/vonojogisigiguwaw.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/64535721655.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab63f3906f2---32183775765.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926a79b5e6a---99061431376.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd18c7b143---zezuperefusexajozixur.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/lutekanag.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc1ec3b3ba---tixajuduxuzuzugemig.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61f9952752---6320435780.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/desarutaxi.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/15925423844.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/86566918937.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/jiduxakos.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1610da23e3701d---40714510243.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/15939064593.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3affb1a44---88151123865.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/07961f1e2fb4b0d90100537001d36897/mogelivajimogarilexak.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846aa2dd6b1---21950663725.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613193bf5e810---fofuminoziketud.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/94802782658.pdfIn PDF document text
    • http://xn--h1aaebbkfib4a.xn--p1ai/sadm_files/67225994703.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/04105c9d76435fca292fa68672fe6e5e/zikemosetenegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=o+amor+como+revolu%C3%A7%C3%A3o+pastor+henrique+vieira+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_off00010e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001261d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261D 22384 bytes
SHA-256: 10282f20ce651ed8672e9a27080203d979e347d450dc5b554781fe749ce79554
font_02_sfnt_off00015e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E8B 11684 bytes
SHA-256: e203a208f215c2690df9d3eadf393f2368be12c711812d2a1be6edf3ba80b00e