Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f7e9c30acd8907…

MALICIOUS

PDF

101.7 KB Created: 2021-07-02 14:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f762ae697779c6712547bf23f658ad19 SHA-1: b413e140e47beccb1d789d292790b1ff018b9030 SHA-256: 98f7e9c30acd8907b0620ed7b58b0cd96f6b66bda1eee6ac778dd2450bd60b1f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

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 https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32e7280ca0---nojetit.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/au59lbdghp0r738sqeab5l2quq/68170417757.pdf
    • http://primaneighbors.com/userimages/27922448517.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076df5c0d38b---65832267464.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ad9cd6v2pg35o3aalrt3k6ak44/67953493870.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160960089210f8---tukasubifex.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/8b31550fde686861288b8334d29e8fc8/dafajapenivenixadonivote.pdf
    • http://hurtmar.pl/Upload/file/goxurowopodotimam.pdf
    • http://bjsprt.com/uploadfile/file///2021062316521835.pdf
    • https://media-get.com/userfiles/files/56128190018.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160898a143e184---21086765293.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/7ec3a76c50d411d0d699b6c12f00f302/jutavaximukugunawutelope.pdf
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8bc1403b1---108809595.pdf
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/65938858364.pdf
    • https://marljivo.hr/userfiles/file/69099847227.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf5059fba4---58276618068.pdf
    • https://tenfci.org/userfiles/file/tosipuloletaji.pdf
    • http://www.herbertvanderbrugghen.nl/draft/75686684955.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dbb1b4309---75561181556.pdf
    • http://ankaser.com/userfiles/file/manujulizamubalajubezut.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a286e71318---48812452812.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a1aa972d900---86803642977.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/ea9523a5924a294c1cf2b87269bf7710/41316216373.pdf
    • http://strandedtattoo.net/file/xeronogavefazovujuteji.pdf
    • https://webvitamin.vn/app/webroot/uploads/files/58831150718.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=archeology+meaning+in+english
    • 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_off0000f479.bin
10180ef9c109c275d8fb43403977fa9569bf54ca9df63b53620dfdb786aad0d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 17072 bytes
font_01_sfnt_off00010da3.bin
2b38fd5931a2b9caaed0b957f50ec9dc0e4c91a71f588102e290c14877091ad5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 2056 bytes
font_02_sfnt_off00011700.bin
3770691c2f0465e0784748098053a4ef71752f2aa71a95ca290e9e1631ff3266		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11700 10676 bytes
font_03_sfnt_off00012f4a.bin
fb684f6e6d65479ea56cef7208eadb5c005f8a22b1a24beb68b7865a80d2ef3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4A 25428 bytes
font_04_sfnt_off00016e99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E99 16792 bytes

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