Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9035fff8646fc2f…

MALICIOUS

PDF

79.6 KB Created: 2021-06-30 07:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f2b09f127c366d9b9239333f6ac9589 SHA-1: b405e307def1e0ec57f4dcaa2adb1c15e290bc6f SHA-256: d9035fff8646fc2fb62a98535d80506f0884dab24a6356641766b24f57fe9bbb
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites hosted on compromised WordPress installations, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common phishing or malware delivery technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/uni8jdgnbvo9rms9due1ddsf76/lafofajenefupujuxubeneru.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a75fd0886c0---gugejerakafotatujukop.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785f7e036c7---dexexu.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607797a43b5ad---buwodi.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/s9enroh7dvdj87oa4ponvmclg1/zaluzigadolupabugoxaj.pdf
    • http://domholidays.com/userfiles/file/figiwamufatad.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608b828ab4ce2---sajebijuxeduwipuno.pdf
    • https://dm288.rs/slicice/file/33802228373.pdf
    • http://soft-pro.hr/upload/datoteke/95260799460.pdf
    • http://anapro.com/ckfinder/userfiles/files/36888658461.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad782b2f7e6---43085126252.pdf
    • https://laplacedesstores.com/upload/file/bejezuxedod.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/debijox.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/petelefikatexu.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988c5863027---90034590739.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/62f750c9b9dadb322817d6dd3f7e8841/zusoxifixiguve.pdf
    • http://somsit.com/ckfinder/userfiles/files/955314377.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d77e983d4---siwobav.pdf
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/mun42p75i2frq3co4h7p0t8s27/rupemupaxamugefo.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/55351145809.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b1df3d2bdb0---93874059484.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/3c483ae2c878ed7f1dc6bb43396a9826/20924100751.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/9e9c31e3a00ee621d45ede70dcaee7e7/rikutodudopav.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c1cf2322d---zedizarugem.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=noun+and+verb+practice+worksheets
    • 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_off0000d368.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD368 16792 bytes
font_01_sfnt_off0000eb7f.bin
baca7a0bf80d81c9368c2cc90cc1414eb140aed0581ca28078bf9233a728dc76
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 11028 bytes
font_02_sfnt_off000104f5.bin
2b45f26e90bffd8ea7c2bbb9740c6479b7c509e7d5dfd7a5e85a8d8a9a4fd678
pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 16840 bytes