Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95441a4a4a71be7…

MALICIOUS

PDF

88.9 KB Created: 2021-06-26 05:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2fe843628582386d2888b7b06905b5d SHA-1: fea3d24498de85a7209782df20c7b3886705f62f SHA-256: f95441a4a4a71be7e63adb1e03781034bfd912bc1866c61b2889fd1c68da8c69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users through a seemingly innocuous document to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/7vaf6gdr1rof6k4tgmeuudgn7l/53029793019.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/gigilonevixutudumabuvewob.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/1hkql8gbvh0fa3p0k7mdr8c383/moponojoluralirupipi.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/552aac17bc18aee1c5c919b7015fd5e1/juromifanepojiveled.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ebfa42be9---kamafakafisunaf.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/eb1c63bc08b1f30c776351bd98d0b36e/93430272402.pdf
    • https://isleo.com/i_photos/file/84126502080.pdf
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/15639380940.pdf
    • https://kodcomputers.ro/2664/uploads/50434502082.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/c063fe0142477fef22595700535af6f7/korovukuxovunufun.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b983d1e90fd---zekidunelokusunuzifevisez.pdf
    • http://gadkowski.pl/repository/filemanager/file/38065661071.pdf
    • http://renovator.cz/files/file/fomalikaxoxedebun.pdf
    • https://balbok.net/admin/ckfinder/userfiles/files/67970251799.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/r5tg4en086o1geoa7a0fthekrf/vekirumuberede.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/e3951afe0e691c03eb43fad76d721825/fusawakujorivoj.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adbc5440be6---tipodaxukisewaxawular.pdf
    • http://humanitool.ru/userfiles/file/lixolobomis.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/1ioe2pmb04u9vh0m84uiu5etf0/74265376285.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/foduni.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/01c9f156045c609c6c491ecd71fefe01/fidixokezodopipegimesa.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a485e22c959---42214724996.pdf
    • http://fmi.lu/userfiles/files/63942811749.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac2761407b---5006177057.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d57c423337a7d5cd336ed5e935c25027/magimabuxanano.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d21c46e666---mivagorunidaruvuje.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b3bc1a583---lawuj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=yellow+brown+mix
    • 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_off0000fc0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0E 16792 bytes
font_01_sfnt_off00011425.bin
dd6a047a7663cfc94ef095ea7ca78f87ee6af7fd585345a190433aa957f113a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 10152 bytes
font_02_sfnt_off00012abd.bin
e88bbd4a3bcd1e19091b0373ea4a10883f7fc10ded8a6cf61361f8783d0ab5fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABD 16888 bytes

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