Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60435edb3fc0843…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 16:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9bfb53fb11a83fead90aed49d4e9b751 SHA-1: 38dafd387b1ecbf37378fb984f75de59bc65006b SHA-256: a60435edb3fc084377b0f0f514c1cc521a12eea1eed65addb0c26930d44c7d13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The primary attack pattern involves directing users to these external resources, which likely host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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 http://dr-temt.ru/images/file/23641531324.pdf In PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160901350b4f5d---sevoxewawugitav.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/fojofiva.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210714120523_snvkli.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f938c0c52f9b5f57edfcdf779708c546/40755417730.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160da0ef74f58f---42011692124.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/4e906a009c14960331d023f6fb84458b/28659610225.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/8864140805.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609827a95580c---84948947995.pdfIn PDF document text
    • http://airfa.it/userfiles/file/82059515351.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1b577b6b6---giwoged.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/0a3bc1598b40d6d50fd1cb2cca480178/xomatolovu.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/vasotivixuwojolemetarumes.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/91811373606.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/47744016650.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/godajepavekujerefesir.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d360714086---41748032879.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/35631581450.pdfIn PDF document text
    • https://vestol.bg/files/file/rawirusi.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/77594282170.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/ladilawe.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/tuzanin.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0990212d5---56485121696.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/padolojanelew.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/xatororumetota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hp+laserjet+p1102+printer+manualPDF 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_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 17656 bytes
SHA-256: 7506099a0cdd985ae64c27a4e517d031092b063d1fc619e8a8f59558b44f2186
font_02_sfnt_off000127b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B9 10808 bytes
SHA-256: fcbe8b244ed5cdc6754e15c3617e4b5217c7c9df41b359019b87cb9ab748a0e0

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