Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd4c575dc409934…

MALICIOUS

PDF

87.8 KB Created: 2021-07-26 21:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d462799a9007db4104e3514aa5003370 SHA-1: 0f03e05764ef40a09549d3a0041acb31b3ce7da7 SHA-256: 5cd4c575dc40993437328d17006619ff418040f5f6db3261823b099b7bbd2a05
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or SEO manipulation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kutyasturak.hu/images/files/4020378887.pdf In PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/61966376179.pdfIn PDF document text
    • http://alltechsro.cz/files/75876042207.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/vowov.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e71d095bd7f1289984f2d5720ffa593d/mobaxam.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/bj1tqivn4lllplo72ksrfo83vq/ravanikunikoniz.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/c17e2eb70342c1fd04426c2271aa4238/dusofufusirigox.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c311d3918c6---17034510826.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210519104717.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc024ef21d---59574565192.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/47mik74mllmlv9msmtrgnp5u7p/wugejijoboditukesodobi.pdfIn PDF document text
    • https://kildevangen.dk/files/20582074125.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc51360d68---simekuve.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f56fc6dc5a094d311b1fbfd9ed06dfa8/bisowadawebasikegilebik.pdfIn PDF document text
    • https://iword.de/userfiles/file/54956198026.pdfIn PDF document text
    • http://schokozentrale.de/idata/siwikudimikaruz.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/5d84fcdba3b1402d1e5836fa6ec291b3/galegirewexejezemopubur.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/rtsa8g8pj54di5fsqk5cb7urd6/divarisatonezazisog.pdfIn PDF document text
    • https://brakos.it/file/82192062237.pdfIn PDF document text
    • http://iccarrentals.com/files/file/37615327713.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160861d021185c---timosezetawikafal.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/pn5pode1803e7eadvtfgob1a2u/18287551009.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16233085047558.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/49838206282.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/9a94a3d1d0806e07b8a9cfa590366b76/viratapuneke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=what+is+the+message+of+the+poem+annabel+leePDF 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_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 17060 bytes
SHA-256: 513455975df89067b8080b3ae21407b30477438eeb6447aa4bcc3f19f4a07566
font_01_sfnt_off00012068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12068 10836 bytes
SHA-256: 0a9bbd191974a207f439287483527725be53c468ac57efcf6268e88de78e7eb0
font_02_sfnt_off00013904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13904 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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