Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f17ab2195bb0f66…

MALICIOUS

PDF

87.1 KB Created: 2021-06-26 09:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cbf965dfcb948bfad95fd2a0fe7aa43 SHA-1: 218deb89718a47c04864fd23d2dbe77f075df842 SHA-256: 8f17ab2195bb0f66e4e0c25b923c0deaf25699fa996dd25062c97c5a89bc6035
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. Several heuristics indicate the PDF is part of a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c874025b82e---fenusofox.pdf In PDF document text
    • http://anandtouristcorporation.com/uploads/raxodimarok.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/fezaf.pdfIn PDF document text
    • https://altbuket.ru/files/segevitagadimogizinit.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160945705aa8a8---lesevaviwiva.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/duziwomonamenavux.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/tajimerodevenegiluwot.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608119b7337d3---nowidotubisa.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757892bf407---88045575383.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/33705032390.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/3d02e0fdf00cdb99d53edd903eebafe4/kazefu.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/3c5d3649a9d0b7016119110b82f7bf1a/jisijanuvelatiruzefo.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/jodazi.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073753d5d616---97935231742.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/59630819528.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a3441728763---talopojos.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///selirigisovovini.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc8ffecd0d---42519610626.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e2773tgp3hv0rt7v7q8smgc62/fasilew.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/melero.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a815e6f01d1---87930241337.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/pabojunel.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/sunipapilafojojelalom.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/29567428935.pdfIn PDF document text
    • https://petek.biz/resimler/files/45112026284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=set+automatic+slide+timingsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 16792 bytes
font_01_sfnt_off000109ee.bin
92487dccaddc556df61e236ed910da2be7bcbc3c32cf5cfe518bd250273a5a6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 17244 bytes
font_02_sfnt_off000136a8.bin
a25caf54c450373fca81aa2e23c617ff3f2a9d2505a5b4798a7d04211d1dac7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136A8 10788 bytes

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