Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7716bb19cde91a…

MALICIOUS

PDF

96.7 KB Created: 2021-09-01 09:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 18d58abef7029100ef70f02d3aed4b48 SHA-1: 7bed05b08b8cf3f75d1f8246b652ea8ecd40807d SHA-256: ca7716bb19cde91a5be6fdcde7b9d4b8a151357d88d91d5bdeb56d9955a04d81
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or track user engagement with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://hajnysport.cz/FCK_userfiles/file/54855709797.pdf In PDF document text
    • http://nutranghongngoc.com/media/ftp/file/dawewopilepa.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/53531436537.pdfIn PDF document text
    • http://aquatherm-graz.at/files/rezumapokosoz.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/f3dc01ae1fb6fd55692da96bddd4c7c7/leduburezuw.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d7df8507f1d---rosajubojapipi.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/lapetunifafirimopubabulol.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160802b938be92---2664852515.pdfIn PDF document text
    • https://susta.vn/userfiles/file/xukikojodexat.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2863c233fa---10935678524.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/tituxivunegarajov.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/jolegurutavupewatote.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/23871794343.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f1f0b3e0dd3---kezedebotitiveselowinomov.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/39565823864.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b57c0707f1d---25386955143.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/numanugo.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e16827363---91791446251.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/c72d5p13pnmlpjuns8pv07at34/xulimekerajulozube.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/vanene.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/603e1282259ae2fbb451489954e8879f/41873721250.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/64297805040.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a40d189ad---2137361355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=tower+heist+meaningPDF 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_off00011430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11430 18608 bytes
SHA-256: 57da8790a8e8892890d546cc572e57e8bc2115204028b27933e029b08c968f82
font_01_sfnt_off000144e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E7 10556 bytes
SHA-256: 3c0efe281a7cd79c26d34c83da98309e1b74457f2c38c64251f3cc212707f036
font_02_sfnt_off00015cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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