Malicious PDF — malware analysis report

Static analysis result for SHA-256 2460bb18efbd0521…

MALICIOUS

PDF

74.7 KB Created: 2021-09-02 07:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c36442e08a003b83f80a6723ec1aade3 SHA-1: fb94418b2d478d9972a1b6f9a328c39540d00a7b SHA-256: 2460bb18efbd052104fb75be2bd7243328b98cb6fe171de98abe1e87a0cc40e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and redirectors, suggesting a malicious intent to obscure the final destination. The ClamAV detection and ML classifier further support the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/d8695fe96774abdd639601292c81518f/86206116199.pdf In PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/49877845974.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/22873079129.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/suwozezo.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bc4cbf286---84057826188.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/s64f4vqkst885m70tjp49ljrr3/wuzanuguri.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/65911782346.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb50eb7c1a---daxolabodutuzur.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1958cae637---nekefolorebovijemela.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/70875078118.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a048e413042---64667276524.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/nolizezigonekavufez.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/fomiseresesufekugewoworu.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/dufaki.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/6b97f8bb5452826e47a301cdf48bd59f/dojonegebapatofo.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/11932312248.pdfIn PDF document text
    • https://htchninc.com/d/files/974444907.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/68158408677.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/6a3e90al7n6vsp0n64npshqugk/61308113276.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/bofuvakipebebax.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/51534646830.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/vuxonesobegopivafixajuz.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51b22c58c---wavudeperewawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=find+the+unit+vector+which+is+perpendicular+to+a+and+bPDF 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_off0000bc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD427 18144 bytes
SHA-256: cc7f7a46af183ebb7c7420063328e902b00afcc1ca530c66c44539e94bd710b7
font_02_sfnt_off00010379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10379 10980 bytes
SHA-256: ae494bc2d27d688ed20205a08fdddf29c7030a37be69c896e09a9ece3d3cb186