Malicious PDF — malware analysis report

Static analysis result for SHA-256 4324e3dfaecb53a4…

MALICIOUS

PDF

97.2 KB Created: 2021-07-02 13:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 145ddcbcbd0497cc956fc535dea8f7f0 SHA-1: 9f09d2ecf5465654131936de8c20f7395222037a SHA-256: 4324e3dfaecb53a4336dc0c7a41a89fc78d2f825887c5fc1dd051c6abf3c5772
164 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 CMS upload directories, indicating a link farm designed to host or distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The sample's primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2f08bd027---71443435434.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/bere6ikehihfefsht2o7j1bohm/49869543459.pdf
    • http://eyupsifalibitkiler.com/resimler/files/libujisaveriwawelalumes.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/uvf18i6ltblegoiv9dh655sp7e/tofaxedidu.pdf
    • http://hubbardfamilycircle.com/clients/62940/File/gepugemuwimamemekolex.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d5e1b7f14---junijuvogezedumexa.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3c9704d02a08e80e02dec2726382b085/93630054893.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/7a4f74e2197c9f20f97c6c08919142e7/14791304576.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823fe74394a---lagadosewevofozi.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/xuzuvukogekamuvi.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b2bcf527dba8fa631a58c4c1ecc23c10/27732881429.pdf
    • http://forter.vn/hinhanh/file/musemujilufebibaxep.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fb23c4f57---37636496756.pdf
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90367360432.pdf
    • http://anatolianlgs.com/userfiles/file/56707602176.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d1ae74897---33781192107.pdf
    • http://stavclearing.ru/upload/files/62622566737.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8510cae06e---lexixute.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071689922a93---56636404774.pdf
    • https://alixdemassy.fr/userfiles/file/leputev.pdf
    • http://schmetterlingsgaerten.de/file/8117784121.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=yugioh+duelist+of+the+roses+android
    • 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_off0000f1f3.bin
538cf221096c260e742646f6b2857867be0200039ba8f0e95324080bb18af96a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 19448 bytes
font_01_sfnt_off0001250f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1250F 16792 bytes
font_02_sfnt_off00013d26.bin
5fdb494345a4f794f52430c4a88c9641ce958651dddd38ea140c5664f3957092		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D26 10716 bytes
font_03_sfnt_off00015576.bin
c7859bf6120449dd3ac522076fece2722d63ae0c836e35bd5cc14c9b5c769497		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15576 10140 bytes

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