Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab38683c76b4e699…

MALICIOUS

PDF

87.0 KB Created: 2021-07-01 23:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a28acd47e61030adc12be2df19bc946 SHA-1: 5c84eff40bf0b9261275108aed55c71e19a7cae9 SHA-256: ab38683c76b4e69949400c772ab07a618c9d3abe37b4aa467fcfb8c5176c6296
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a link farm used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cructi.ru/uplcv?utm_term=simple+present+usually
    • http://taiwanglassgroup.cn/userfiles/file/36198202458.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e67f24d3058da90f17bd691732b4442b/kalof.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d7e6f3c19---79349145579.pdf
    • https://sunarchegypt.com/userfiles/file/jerodasu.pdf
    • http://www.lugashotel.com/data/editorfile/lilonosoxob.pdf
    • http://skrabl.pl/www/rpbd/fck/file/3970828920.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e8f45da8c---mosobiza.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61313de403---66800710107.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/5bab3b1d14d49e2204c7322f61550aed/rufagerezenatimugumowodo.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/da945d77928606c88c775b4c5895bd51/lutowetaxinajafozura.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/2ad7ffda63142b478e323b0bed2f9f5d/vafope.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/susonumofonup.pdf
    • https://bakwanudang.com/contents//files/nigamekorekuzevo.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/93f55647243949976fbb4694af964562/92911260219.pdf
    • http://akinmedikal.com/uploads/file/pezalilimisikozaxa.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160795f921ac29---nopoluwamexujiwe.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac738128c8---fozujomozevelutametoziw.pdf
    • https://vinadesigndanang.vn/uploads/image/files/bewis.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/8fd0c216eee87fe4eacaafb109b43ac2/39134174684.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16071be9b7dd6c---mejefumonixuxolejorawo.pdf
    • https://resulgame.com/calisma2/files/uploads/92608145632.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/buwarizovozam.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c631b643975---fenezujolimakekopa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 16792 bytes
font_01_sfnt_off00010946.bin
108563e85830c0654ead6858ad7bb81e24b26f0e751fa58b6beba2f753dedb14
pdf-font-stream PDF embedded font (sfnt) at offset 0x10946 10580 bytes
font_02_sfnt_off00012163.bin
12a7903a10d3c5969f38bdfed1c67445989afe7d09880603eb2f66146378658f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12163 17608 bytes