Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5e5c06168030c8…

MALICIOUS

PDF

90.8 KB Created: 2021-08-19 11:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad6dfa33337c38653c0fbe39460f6747 SHA-1: f800f10d065f53049f6d02000e34be00b3f9c4eb SHA-256: fc5e5c06168030c81634bcce9eb57824cdaeda49ef88261c2bafa355519eee14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of numerous links pointing to compromised WordPress upload directories and other disposable hosting suggests a phishing or malware distribution campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://munsusa.org/userfiles/file/20210629204544.pdf In PDF document text
    • https://n-zvuk.ru/upload/file/febal.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/kogiwefeke.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/kakilezusebazixif.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610c010e668b4---furevomolekegonije.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/89871805886.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9fad55e71---fumutupiwus.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608786da763a6---jejivinos.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/pojagokaguwubataludofu.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/zabefilesaze.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a48e00199---xubexejuxumugezajewov.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/mutoxaresibe.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/r01lj08fi2b0v7au71inc1v5i7/zatefadisofulenudowari.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/a6abd07871efcc004e5e03ff168f6a74/7805680040.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/pizemu.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/0819k8t297e4o47jfisn9p6u9s/bavasewubu.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/2rvb1qhi8jl0vsoufc75psp51i/26191958174.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/lilalutememesosubi.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a379919f625---13574936010.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/n08lmlm5g2qcp6ntinovmnc6vi/43778555698.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/loxid.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/55499034015.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc18fd2021---60613147206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ticker+tape+timer+simulationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE5 21760 bytes
SHA-256: 2f32d9c87b3daddb93bb0505c0d830eb10a41a0d01db2394d8254c342285a9e4
font_01_sfnt_off000116a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A5 10688 bytes
SHA-256: c290d3ae983e318417a3c389aa92b0089c54077a78ea0f9d197d76442c4b63b0
font_02_sfnt_off00012f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F27 6448 bytes
SHA-256: c2a090554abc50f4e75ee7898dcf982afd83cf6e5a0ee042ce5d3dc7c90e86b3
font_03_sfnt_off00014522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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