Malicious PDF — malware analysis report

Static analysis result for SHA-256 db431d3c8d103e98…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 01:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67973d372a8c439f98c451d58c3701e3 SHA-1: 1d3cfa46f55b4f02c2790590fa8882c532a0607f SHA-256: db431d3c8d103e98e6ca9d10d4551f438b41c93ad666f8ae13a8e7d5bb1f23cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads and disposable hosting, forming a link farm. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16136956d7b86f---rivinezowalurelutav.pdf In PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/ziwopejopobogupivabop.pdfIn PDF document text
    • http://regmac.net/userfiles/files/43843287326.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/sobezokevi.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/8853675551.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/66581766915.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5a5aa5a536754c139f814b0b3610340a/23021043513.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/diwenesatuw.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/95899473544.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/39314342792.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/6ft4t20jfdegtoddqhgvfdorp5/gokavozunajagomoz.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/tivozasefogotawunefose.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/bilemodijifunenemuxitijog.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/2ea7e85310d56b2e47a95c111d20e28c/97945632233.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/99594782712.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/84218852455.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210917182433.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161304232181c9---59781919122.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/bejalapodixalogozarot.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/moxupixa.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/dewagezaxaf.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/084d62c3fd636a96a2e6aa0808e3803f/4043893117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+do+you+get+sms+on+your+phonePDF 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_off0000d878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08A 19312 bytes
SHA-256: a811ec82f2d5922a7e1ca5efa25508e328a2da1aa0a17eaf772bdca5d44a3261
font_02_sfnt_off000122bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BF 10828 bytes
SHA-256: c1f9c678feb2ea53ca874d26cd27764a2194aa31ed8290afea5553a6f0b69987

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