Malicious PDF — malware analysis report

Static analysis result for SHA-256 028238b343b7aed3…

MALICIOUS

PDF

109.6 KB Created: 2021-07-17 11:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2150f0e61c643fd437c88c1989507c26 SHA-1: 14c0486050865ea28dec04815965ce5415b4bc25 SHA-256: 028238b343b7aed37ca1be024bc822f333972c2748e96afecf4fb3917cb57702
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute further malicious content or manipulate search engine results. The presence of multiple external URIs and link farm heuristics indicates a primary function of redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://gccde.com/downloads/blog/geust/files/bopajubi.pdf In PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/2f6e3e2a916006c54b8cf6b9f0ac27fa/48314501551.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/097d08069d5d687b3039b987df6b0072/lofojotedumuzuwavukuji.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/92613582563.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/09583d7fdc5f98d6a8bda0f270513da8/69543614009.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef73ae1700---99911525952.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/xepegonuzabisokunepabole.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/n5afkdhmjtvovnlf2s6kq0na7f/guvuwe.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/gumenemirugewurebamopur.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/miwetidujuto.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85b4d7f192---18592243387.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210509015343769.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/38069429760.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0088d30b15---bononajames.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/b295650922d9558ee9b046007516815b/88098691420.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/9oldq43ev6qjf783j69v02ttn2/72271754432.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a5baf373d---62712069952.pdfIn PDF document text
    • https://maintogelonline2.com/contents//files/vedosukosedevakutibob.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/60805189334.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a718094761d---39891969302.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/13891344280.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/b7f765d007f8d09b122444b36a60873a/49457684997.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/0fd6a586cc7abdd8673d7ba1485ee071/xuvaf.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/l43mb3frs0vvogirjpcq7uj330/51273936368.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ec5c81d9---69729680029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=crack+width+for+water+retaining+structuresPDF 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_off00014b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B3E 11016 bytes
SHA-256: e4ceb9ab8165a629d4d2e007f74fabe6498c21256bbab496c2a77e19598ddec6
font_01_sfnt_off000164bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164BC 16952 bytes
SHA-256: 2f2187cbd909c3853c8e00685b28b2a2694da610fcfff338c8103134338e7262
font_02_sfnt_off000190cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1