Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4f6d392d0b0c4b…

MALICIOUS

PDF

85.4 KB Created: 2021-07-02 06:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f3a7a38a723b055afe16fc4acbbb68b SHA-1: 6a12c0b623d5cd53ed7598453196bfeee4dd3123 SHA-256: 9f4f6d392d0b0c4b55cb4c92ac32f33f15ac66488fa67f497a1f8a0eb4ff0f68
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress installations, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and numerous URLs are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/6b86102160952efa176361f94b0e50b7/zajofoxos.pdf
    • http://cdmatik.com/uploads/file/budewunuk.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/9614fd48185cdfa7e036ad69f4d8e699/bumilufuwaxog.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb705c28c3---47688746795.pdf
    • http://chikatere.com/Upload/files/50549525980.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/5e615dbc76b9d66f1cf1cf08e5887766/bezek.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a0b2eb1c5---28798098428.pdf
    • https://steammining.com/userfiles/file/24149850116.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0d3d9f6dc---18648479566.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/ac10bee260ae1f1c21d6fca68366306a/65469923104.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d77934a5aa7---jigifebir.pdf
    • http://espacioschillout.es/images/admin/file/27676052190.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d836eb74a---33640976505.pdf
    • https://patoman.ro/ckfinder/userfiles/files/88548434206.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc802324ae5---82847845839.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/70e4677b1b51d26f55d878b3060fa745/tatulemevizaxanevugojiso.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ab5d7a977---98843975887.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a10846ade2---78607878108.pdf
    • https://agrimal.pl/userfiles/file/69168913647.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ouqjopujmp1g8bfi12lma5n6ka/dularaxet.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/g9rb728r89tn1ph79jbfghp1u2/kunifona.pdf
    • http://rolmech-strzelno.pl/Upload/file/60027573391.pdf
    • https://sunarchegypt.com/userfiles/file/17499360397.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=exempt+private+company
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e325.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 16792 bytes
font_01_sfnt_off0000fb37.bin
2909c05af67c3c5a69cd83e2ddf0bbe4df7a9345a8060fc0486e67584a95863a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB37 16640 bytes
font_02_sfnt_off00012662.bin
ed8d528d3e7ead5e853fdc4cf297566f2a3e74903930bc278d720bf8a4756336		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12662 10588 bytes
font_03_sfnt_off00013e88.bin
09addeb75f39ef01c72f38ccb3b1c9f6bff4dbc821359ea601ab83b7620a7d65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E88 2252 bytes

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