Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d64aaedcf88df0…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 19:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 136bddf1c17d648ef288c552d8b2777c SHA-1: 1e8e632a10302f53ff70f647f006d6d9eb8fdf85 SHA-256: 05d64aaedcf88df067cb8a579e0a058b666af9be8bc4da2cd81c4102b15e2b48
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 disposable domains or compromised CMS upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing malware or phishing credentials. The presence of embedded URLs and the nature of the links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=guardians+fight+full+movie PDF link annotation
    • http://psychologadamczak.pl/userfiles/file/92507883019.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/ratisitaromiz.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/6509502606.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/90036102256.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/pamorowozokonitinapis.pdfIn PDF document text
    • http://gysanya.com/upload/file/210906194654318090bjt19urmt809.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136be900b866---fezixo.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/luxerajewojikaf.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1612f806704a11---winanuxudo.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/dikamumepaviveweretegese.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/4967476078.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/62748963657.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/zimoraterajopa.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/noranuvawatep.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/xajakekakagifedad.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/lasimob.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/6136739b5fe6e.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/35756658905.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/vofesi.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/99620831157.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///weteselaxe.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/54900522469.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613994dfb936c---3549481860.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_off0000d5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FF 18420 bytes
SHA-256: 6b4e4e3508c674eddec4e17e29b51825124a2f1df4133b45402fc9d0a18595b1
font_01_sfnt_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 11004 bytes
SHA-256: da3295485ccf1386e29411378fc0dcaaee2ce8ec3331c7e1d9efb66d2fcb7c72
font_02_sfnt_off00011ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1