Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bff5baa3cc849d…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 06:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed143c21fa9c803c395f951380451e48 SHA-1: e1db99379426a18690d03de0af3ce87388b88b5c SHA-256: c9bff5baa3cc849df8d74eaf4309a6b8c853b8922eaca67a57a8dea6c0a92434
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs and link farms pointing to potentially compromised websites and IP addresses, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely serving as a lure for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://alianzablue.com/aym_image/files/76047817736.pdf In PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134696012749---22928982350.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc4f935755---80575456749.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/88aa41496dd35606466e3ff0c9b84035/362339410.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/lumujesidojuguvebuvejet.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/87534379919.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ufj1ilb9i1bl8f44i27udus804/modiwujozopik.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/26549387083.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/tebipogogexelum.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/pivolujefinekoguve.pdfIn PDF document text
    • http://micruts.org/userfiles/file/95557484452.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/65228100857.pdfPDF link annotation
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/difijo.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/wofumobapibe.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/zuvosexajupidujizam.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/detugel.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/filujajakug.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/81807116428.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/wejudebabejemofumamowaki.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/54128687181.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210907094454.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/75137550421.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-5/20210905065835725563.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/fakisawonejowul.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/muzupamawijirog.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1c517a40f---sokezumagezegivizebar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=random+credit+card+number+and+cvvPDF 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_off0000db57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 10668 bytes
SHA-256: a7578e1d240e492c223e34a431fa4b1f0cb67bbd68269ed805e77aa62cd5208b
font_01_sfnt_off0000f3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDC 16764 bytes
SHA-256: 6ffad578683686e12cc14b79bc22dfd86bc8cce84492b320d49546a129f42813