Malicious PDF — malware analysis report

Static analysis result for SHA-256 da55b4341af7f51d…

MALICIOUS

PDF

83.8 KB Created: 2021-07-06 18:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36ecf14e1850fe5ff7f1ebee35a033b4 SHA-1: 546e685c9c922053fa33c6a98a67fc668a3c4bb3 SHA-256: da55b4341af7f51d60f18f40479f74c2233fbea9ff1c1919d2e41cd858af4daa
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links are likely intended to lure users into clicking them, potentially leading to phishing pages or further malware downloads. The presence of multiple distinct hosts and the use of disposable hosting reinforce its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/kl5rv8rehuk5g69ght36kd91aq/ganujutexivilutov.pdf
    • http://designbeginnings.com/upload/file/luniforerekagobulimiw.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/o5uqhlkkmct5uq4rl9a03jgcgt/zozozeritamebe.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c945676f2---66521902642.pdf
    • https://rrr71.ru/upload_picture/rivoxugazonovekadafug.pdf
    • http://mistralizmiryonetim.com/uploads/file/88074799274.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/2f096e36faf31f8b22c50a05654fa4d4/72583613654.pdf
    • http://hasici-pristroje-eshop.cz/files/file/pivuzaxigixedonasaluzunax.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/74819870180.pdf
    • http://micronforgacsolo.hu/UserFiles/file/99570462269.pdf
    • http://asijskepotraviny.cz/files/file/86507969727.pdf
    • https://coevent.ru/upload/files/pemibuxomeme.pdf
    • http://ldbell1965.net/clients/85689/File/vavosawelugixirasizu.pdf
    • http://zae.me/datafiles/file/73730667424.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/wenajivefokada.pdf
    • https://acgroupenterprise.com/userfiles/file/regarebe.pdf
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/f6sh3d6v26ok8h4s714gq8sq90/24725586885.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fd930dcb4---95801548763.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5e999a2d3---dabapevulumedofowekimak.pdf
    • https://goldenapp.net/file/16750142794.pdf
    • https://soalmatematik.com/userfiles/file/55014653911.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/wagebuxomemarafusofates.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd45b4d38f---mazipexinaj.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/207cacde4f9767425da4383d04f79040/gimukoxuzavenumoledalu.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608befb83f6d1---zibebiwo.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/5be5e1bd45bb3d373fcd67fd15d4041a/zazuziwajezexowonepi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=happy+birthday+in+special+font
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e252.bin
77dfbe0033eac42f5a68e3c9f92cabfc2e09b04c3cce4cd61494c47216a758ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xE252 17220 bytes
font_01_sfnt_off00010f1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1E 16792 bytes
font_02_sfnt_off00012735.bin
40692987d595f99a1623625ce68a6d525f1d9ed0e26fa0c98e06707ca1eb07f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12735 10960 bytes