Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f52dd8251c2fb7c…

MALICIOUS

PDF

86.8 KB Created: 2021-08-14 11:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d7343ac84c67070ed603d36b3296504a SHA-1: 930f57ac656e2ee3822f909192b7eeec825b03bc SHA-256: 5f52dd8251c2fb7c483d085fbd65a85628dccfab35047708d8bf5380b66cf51a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating it functions as a link farm for malicious purposes. The ML classifier and ClamAV detection strongly suggest this PDF is designed for phishing or malware distribution. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://huntic.ru/uplcv?utm_term=alberta+learners+practice+test+2020+ama PDF link annotation
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609fededb9ecd---sonasulenafu.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/nulutepe.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/c07ecefd615b979dc70c27e43a10ec0a/1621916839.pdfIn PDF document text
    • http://xo-sound.ru/userfiles/file/89659614762.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/rhdod7jkhoc5j397nsd9aee6v9/17468110044.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/24618811194.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/lodazib.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a076bc17fdf---dokivebus.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/fepejogajulidexavanak.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/3263565208.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/xotomofizugogonivigirenas.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/rowikogutigadixowopuj.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160718f130c54d---bujipufuba.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c061d0d0cea81901c14d57677353e510/gofivu.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090940c8f909---28867151620.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c869cf0b508---fufefugapirimivosazix.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/xopiwosumidib.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896179863d2---baborebikelorafaxopam.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/31625714429.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/82718790475.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/37787181206.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609180b42aa31---sibalabowebiru.pdfIn PDF document text
    • https://jagominum.com/contents//files/dutetogiket.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/wobimunujavabizepifegozo.pdfIn PDF document text
    • 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_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 17332 bytes
SHA-256: 391a551e98ecf8f961833895ab97a70c6aba44414664bfcab0f2e81f42746b41
font_02_sfnt_off0001342a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342A 10776 bytes
SHA-256: 8606a0b443782c00fbcc2e01d2939a60a6d5a23c47b7d6341da812c06e45d7c8

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