Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e350bff99c1bf61…

MALICIOUS

PDF

115.1 KB Created: 2021-07-23 00:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 649323cb707f2bba54b62412990d0711 SHA-1: 0be732179202f39164206c855c93e7de5f3ffc48 SHA-256: 2e350bff99c1bf617ff274cab5a75cbe39647d197811b98353b01b82d5215332
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the ultimate malicious destination. The presence of embedded URLs and the nature of the heuristics indicate the primary goal is to redirect the user to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://andrejc.si/files/file/51454765106.pdf In PDF document text
    • http://obasekiestates.com/UserFiles/file/zufetovuxobisarakinuxala.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb4c398cd6---fuwerowibika.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f9cf861f979---5758393742.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/8r04jsjug447lhv4jbtorq4bhm/28615275236.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae58f3a2f6c---bejunigamuzujodudar.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/tavokugenijepesagaxu.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/guzaxorusidazej.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/6279667a7717cc06609a0208734c667c/kewopotu.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cee27628d3d---8596920278.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/1c30f7mbdv7e7r9gts38ehq5ol/3680405058.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/a2ifapf2sb7qj6j9fugsefa0a9/84114230793.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/gabag.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b72942895a---sided.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7c320041f---sulomexaledokutovigip.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/sifejapetenubu.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098441188ce3---neneboxalumuxuloz.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9528cf693---83972202587.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/21100062784.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160744c3fdc5a4---9028466667.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/2scakv2eq1lp1s6dds8keu60up/2088073251.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/tosol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=asl+sign+for+hearingPDF link annotation
    • http://irodori.kir.jp/files/file/47423957260.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_off00016159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001796b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1796B 17800 bytes
SHA-256: e5f6d3385bf6eff8434411b517d8218b29e3f9447eb52a513ab2662770c8f7fc
font_02_sfnt_off0001a78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A78E 10376 bytes
SHA-256: 61320f8c3cd41430f3d6b757a2f9235613627d41e56c934bab12420cc8b4fee6

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