Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d78d9067d5d14e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 03:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a898c0e32737d215eab26cca227938a6 SHA-1: cfacb204f8b689116314b3dd08371fb722c49d08 SHA-256: 23d78d9067d5d14e17e5665aba8213f0cd7666eac6bc718ef7bdd2fdf1cb2a97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77f55376fb---90011462810.pdf In PDF document text
    • http://efuturesthai.com/uploads/file/32514842068.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/bebibazafojoratoruz.pdfIn PDF document text
    • http://ekotronic.eu/files/file/vumif.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/10501926625.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/marupezapiwix.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/jatugojedibupoze.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb744ab0d05---votar.pdfIn PDF document text
    • https://people11people.com/uploads/File/fanobe.pdfIn PDF document text
    • http://short-story.ru/upload/file/93983625644.pdfIn PDF document text
    • http://axwelindia.com/uploads/25389687308.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/rutiwobazuxenija.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b7ab8d495c1c2dd51d102e5244ff4315/kolutuxe.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ac86df4435c---87906107554.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a3d468ad6---ribugaw.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210626052712.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/tarifirizekurepule.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7fc85c171---junufokifik.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/87575086879.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/45988002420.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/66474604226.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/235525460.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/c5u9h11vckp64a8pj7hocjhthf/punewatebukutuvinepela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cubital+tunnel+syndromePDF 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_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 10792 bytes
SHA-256: 610ad343b2ea50d53531cf61b937557e2f6ffc371e56d00d67350283aa8bfe9d
font_01_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F98 17836 bytes
SHA-256: 58831dcb887cbbe718b8137eb9fe9c064542948b513d4042f9d986da1f317070

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