Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f04ea0ff36f580…

MALICIOUS

PDF

95.6 KB Created: 2021-07-09 20:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c6bcf2e4cb0045a47aa47e5c7cc12fd SHA-1: 2a4c9ab58d816f8755f2d4a8dcd0aba2571abeb6 SHA-256: 36f04ea0ff36f580682708f9aa636a817c9c234068dbd068c402b81070699419
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings point to a malicious link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160747aea68c4d---70312885798.pdf
    • https://dusunceokulu.net/resimler/files/81667811976.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608019a27bdff---11585995396.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b8929ebe8a56fc0c3d34fb9f7fa7a9ed/36972565839.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fede6eb9af---xafugafal.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77fa0f0376---wititeka.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7aad70427---risewelap.pdf
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/080rhnkccdqjnk2a5nnrlpv11j/84808414712.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5fcea83ce---pabek.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985197b69b0---80790980438.pdf
    • http://www.ufolep-69.com/contenus/files/23342059838.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/mufusid.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e6a2e6d6ce8f88d84d4ac9bfda5d9225/sijike.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd959919dd---fupozidikujegijarume.pdf
    • https://esprimagroup.com/userfiles/file/sijivesegasanuzuziro.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883a44e9db9---rafilosikufimipetomage.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/156b893d55ea2862b295327103cc29c2/3969968421.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f784e1db---fanunez.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ea64e3511626ceacadcc6d45b1e9d6b0/lifujejebi.pdf
    • http://yaeram.com/userData/board/file/bulufejolanajofukafipewig.pdf
    • http://mesterek.net/tmp/jokabefikogati.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc88cd6b229---42521569070.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b273294a3---xefogipikamep.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/1dc7905ae1f25a3f558b93be1fe4b55e/gipegobe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=to+get+it+done
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e499.bin
db58a144e90a656339c71cb6fac74af44cdaf22a3735481d9eac1663713ec117		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE499 16388 bytes
font_01_sfnt_off0000fb2a.bin
7fa8497d1adca363e680a68976d8809d0f5be538edc2c2136a5dcbd950963249		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 9912 bytes
font_02_sfnt_off000110e9.bin
1d3b9be2a8cc6c9c471a453e5b8ae182e3648caa3dc2264af3b351a392c63c1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110E9 25520 bytes
font_03_sfnt_off00014b03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B03 16792 bytes
font_04_sfnt_off00016310.bin
24ac3f092d093c728af5f609523b4c8ea592e02a169201a34796995174667cd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16310 3292 bytes

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