Malicious PDF — malware analysis report

Static analysis result for SHA-256 7517cac1fc3d3bbd…

MALICIOUS

PDF

84.5 KB Created: 2021-06-25 23:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1cc39474f67aab8391f5d9818f92d71 SHA-1: 29db03e8fa7d07a4919881ed7e930c85cae7b7ab SHA-256: 7517cac1fc3d3bbd8d992406ef701ddbec796845b3a832acf657ca3d3918a133
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates an attempt to leverage these to host or distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f905bb49d---dubiw.pdf
    • http://dermalab.pl/userfiles/file/nujomet.pdf
    • https://33mobility.net/uploads/files/dogekopot.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160b082b472d4d---43865310820.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/0a108fae7d66ec7585719a57a316cec0/47983846773.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/aat9p45pl4l2v3u2q4oleiddbc/sanuj.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/ddbf770a4a99f9dc4a26098f62c5d16d/28646033018.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/7c5d923f27eec08b7ae39d76984d60c8/19047913111.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/3f180059ed2e956ceaa6ddca16ba09b9/84321621552.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/d24212b06a33ac1100263a0da6296728/vuwafudega.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/53920690030.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a48b9566e0---2810506458.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/ghhni8rmohntgmck5s4h17us2v/88105023574.pdf
    • https://alexandrapanayotou.com/web/images/static/file/95439237643.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607899e9b2f04---56830903807.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609af13ab0188---nuzerakodutunizi.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899fd81296c---belevofevita.pdf
    • http://budohurtsa.pl/userfiles/file/43947118939.pdf
    • https://muguet.fr/sites/default/files/file/50557806113.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608598cf6d476---78785631060.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/940c3a1d801550437e7edc966444f596/piranubirodejivivizito.pdf
    • https://alatheir.com/atheirwsfiles/file/fabane.pdf
    • http://sutphinsgermanshepherds.com/clients/21958/File/xedelatesevaxexuro.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7410cd1e14---15468797751.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mixture+of+elements+definition
    • 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_off0000e84b.bin
9d1983994ce780db1d8aee1f383d916282ab7f1167a310360c2456c014553349
pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 10548 bytes
font_01_sfnt_off00010058.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10058 16792 bytes
font_02_sfnt_off0001186a.bin
8d8ed3e812da2b9795b880083b5b2bc0970e7122471269a338a36e354450b799
pdf-font-stream PDF embedded font (sfnt) at offset 0x1186A 17044 bytes