Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c7234c7d8b3f1f…

MALICIOUS

PDF

92.0 KB Created: 2021-08-02 02:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91b36f75e74fb43765a1684aef29db8f SHA-1: bd7ee241527d7518518456ef5958b4e99383942a SHA-256: 64c7234c7d8b3f1fcb25cd798e971240fab7e9eb01ff12ebe39b6de684d8e897
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://ilksolar.com/Images/Media/files/34772577599.pdf In PDF document text
    • http://parentini.it/userfiles/files/kupukoge.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/77113940598.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161039716e19b1---bumen.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/zapux.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/q7jaqer291pb2ev2480s5cb1f1/busejemokaxa.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/302003049231.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e83701459c---mupexide.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afde3dba86e---62266545005.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/997a9ba089219a2b20694b30964aae3b/pajodarusiborojogup.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160895f729291d---tokekedunimilesozanunofis.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210612/file/16235225397172.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/putefa.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/fb832hrvb4plc5tgum7spmdld3/pufabakelusufavisubunawi.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/levoradobujakuxalofosuded.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/xujavetexufagis.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/4121664381e42e6bc56f3902087ea737/vesometanipofuzujapoxab.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/174eqej071oust7gmkfvk2mjo0/tedipuzifarujizonixivufi.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/90918408274.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/susovunituranijedutejig.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1ce393cbeafa2baf65e9057091785017/76845268274.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/63475602529.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/depubonigoponufugosefuvix.pdfIn PDF document text
    • http://roleco.pl/data/aktualnosci_imgs/file/45685203322.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/4432f3df239581dad11365f0c1e6e18c/semoruxatonitilupediv.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/pujajovis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=spanish+present+tense+endings+ar+er+ir+verbsPDF 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_off0001034d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034D 10788 bytes
SHA-256: 5b28162554a1d7cfbbc31c2beadcc64261ff72fd9d89128fadb6e3686c1a58ca
font_01_sfnt_off00011ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA8 17888 bytes
SHA-256: 62e1828cb88bf77a81381716029a033f4a0a6374afad59cd7e4f84a7961b9266
font_02_sfnt_off0001496c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1