Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64858e73d77207d…

MALICIOUS

PDF

92.4 KB Created: 2021-09-04 05:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65386a6fbf366f2ae9b6b3c2c7bdd2fa SHA-1: 0297fbdeff629ce07714fcdade22215a091f9382 SHA-256: f64858e73d77207dfd785f219aae66eb77670d62b1794ce9f1cbbe37f673ee7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crysiq.ru/uplcv?utm_term=debt+snowball+worksheet+pdf PDF link annotation
    • https://dcimx.com/files/dufezupebetobexepur.pdfIn PDF document text
    • https://premium-house.uz/images/file/nixobegotali.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9b7f630f56---kaxusajakitezul.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/89426203084.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/junawowazovanatesit.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cafb7330a---63076445710.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/var20gi4t68o62a1sfmca20b56/87760146664.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16079988242fbf---zajuvotonudiwabekojov.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607808ace31d7---219906983.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/xijakujopudevati.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/fovenubusi.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/e1d9vhj7tf3paldlmbqthhc112/jajato.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16110d78c61952---tufuxugezijigole.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/24286770334.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/anp86kirgc274sn98ep5og2sl2/25327789968.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/rafowatefobuk.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/6291c9efcfbe184708e6d92815ddb25d/mobexotuviwerotaxilidetuf.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/q3ilklaqskim1cfk0urban3g42/92885066563.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dd712b8db---rufitudoguputizotax.pdfIn PDF document text
    • https://birudongker.com/contents//files/jeboxubuvutidaletoxo.pdfIn PDF document text
    • http://lg-palette.com/upload/files/ruvokisolorupokoji.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd25966cc68---41564502678.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/29909193803.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e39f91d3bcc---7645302648.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e98b3d78e69c1387011740cf09eb71f5/7946889231.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_off00010503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 17964 bytes
SHA-256: 9ad2d4203bb3b75a8ea53a1f77c2b32085ecf2bd5c0b543ff4b21c63e25c623e
font_01_sfnt_off000132dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DD 10824 bytes
SHA-256: a630b40329e5d5303d7b5eed9fd75466b1a28766941620950d2fe26f2b6bbd89
font_02_sfnt_off00014bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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