Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca3c10714aafcb8…

MALICIOUS

PDF

86.0 KB Created: 2021-08-12 15:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7eef79209352dc71ee971dfe67b9dc4b SHA-1: 9b7d197e69b31f56ca232b1961fe15159c695f9b SHA-256: aca3c10714aafcb883ad34eced1f2f595c49c3f81d0d81a29624db415e2b5291
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/028b116df6cba67869fe222411608516/87884372674.pdf In PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/40383569331.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4e4f8d3bd27931f9a088263c3f98d98a/burodowiwij.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/majewajonop.pdfIn PDF document text
    • https://unosms.us/userfiles/file/juxajinumu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc6bd6650---63356705809.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/wujawar.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/vogemelenuzixuxabo.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/88096436396.pdfIn PDF document text
    • http://df-2.de/images/daten/file/13471550635.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ac4bb285c75c20c23893c44616d02960/vutumejakerajosaguxiz.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/gogizidoxedikepitubu.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///78660793757.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160946e404c863---xepexikasorurefow.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfb4c3f996---rexagosotilubedagogowor.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa644249646---texenidadegiram.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/tibewimovewew.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/41796431237.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/94920228374.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083100690a96---baxukumedisajowev.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/dfp9nh3tce1n4ldbr1oq5378u0/pugabalatibukilakesumiv.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083c7cd01165---15783032218.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eeaaa23ca3---giweratovodisivonel.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/93160661342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+use+a+combination+microwave+convection+ovenPDF 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_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 10728 bytes
SHA-256: 2ca04ee87f507487e2ab94ff61e7e400b3955b7216095e88429f18ff9f9b2c7b
font_01_sfnt_off000106a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 16444 bytes
SHA-256: c36a85ca6045d6a7179dce925da65ee705e305e33068266838084c12029484f2
font_02_sfnt_off000130be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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