Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8efcc101bb12da6…

MALICIOUS

PDF

89.2 KB Created: 2021-09-22 10:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e06c93b0ec25a0ee600326faa6325be8 SHA-1: 659ad107f3b42ae1d07cee7c3bc388c219c69521 SHA-256: a8efcc101bb12da6e2dd912b23593d5a0fd83e02883e58866042783d72da962c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://baikalspring.ru/ckfinder/userfiles/files/fopexategaju.pdf In PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614144e04f43c---nuwivunori.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/63479917014.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/virajotanilupedulubur.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/jofigot.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/40226566851.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415c2dbb361---49777787702.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/fabibadigorefibizigoko.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/goxabawiwexunugo.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/fudilaketevewesojewefukor.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/12356697055.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/64945445145.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/99901127549.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144df49b8a65---zuvokesukukiviwazesa.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/1759079327.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/gjut8k0b2uqear1v4m6cf0gdhn/fujogezabuta.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/goledifuduvej.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/36031867657.pdfIn PDF document text
    • http://konberdbio.com/upload/files/68055715136.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/62663012080.pdfIn PDF document text
    • https://rippa.pt/files/file/filelapupako.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/50121735293.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/17929559240.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/15200688907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=read+purple+hibiscus+online+freePDF 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_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001092d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 10904 bytes
SHA-256: c9414854f1e817bed02cfca6d68bb739b3e282bc91ef892f1c24f1fecba73165
font_02_sfnt_off00012202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12202 20460 bytes
SHA-256: 74ce9898d4424ba6294f3b6f314985e61a4d97a3c106562abf30428b49f2f075

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