Malicious PDF — malware analysis report

Static analysis result for SHA-256 852653fa0a8821d6…

MALICIOUS

PDF

77.2 KB Created: 2021-09-13 23:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2840378b1bd9d4e4659ac24950ced983 SHA-1: fe9e605636a9d965efe57d8a34a69a9610ababd7 SHA-256: 852653fa0a8821d633ac75234b0b1f0aff17fe7d824adc31329beadc6c242a32
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links as a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://envigest.cz/upload/file/salubilozaxorudaxuniju.pdf In PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/45356061792.pdfPDF link annotation
    • https://kenkochaya.com/user_data/ckfinder/files/lijozifo.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/30970094897.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/somojulexep.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/72523596074.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/43210255681.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/99707004153.pdfIn PDF document text
    • https://thehouseproduction.net/file/jawafibe.pdfIn PDF document text
    • http://mestan.by/images/file/rotitixikisopabu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d2619028dcc36d22adab6528487ccc5d/rovunajakake.pdfIn PDF document text
    • http://gysanya.com/upload/file/210908225946291144s3vfwghmrk9y.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/dojepeginarujemovotatij.pdfIn PDF document text
    • http://blgjad.com/upload/files/kikasasijevizibotuv.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613532e9eba8a---wezanufigum.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/xupamexevivine.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613d558a74dcb---18800863237.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/96825449831.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/kijuxobel.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/55dsj9u3ddelb4de5fau69em83/sakomexileropur.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8e1cf3f05085877730a055f40fb58564/vonikajifilepa.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/95917678931.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385475acb08---99907664254.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c3facd1c---76559551821.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/luruvemovobaronito.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/12063204628.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=aplikasi+sistem+informasi+geografis+berbasis+androidPDF 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_off0000ca81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE298 11052 bytes
SHA-256: a5ae1035303176d365bffffd73c9bd456e63be3381272225d83390b43fd8141a
font_02_sfnt_off0000fbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 16812 bytes
SHA-256: ea9e5b7ea7b409fda373f883adbc2b277fd80039c0d7ed475d78e1a81da676c3