Malicious PDF — malware analysis report

Static analysis result for SHA-256 879100a4596a7a2c…

MALICIOUS

PDF

69.0 KB Created: 2021-09-27 06:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61b32926bbc8dd649119123d01828add SHA-1: 6f602fe5d9ac3198b1382ce4870bd82f02a84bd8 SHA-256: 879100a4596a7a2ce9ffeefa6442a32a3e35e009e1b2a689c3cf5259beb90625
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/8fb89eec4b95c3fe89e71c647d8946ee/71029682704.pdf In PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/85942822950.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/gamavoluke.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/wabeduf.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/55339954074.pdfIn PDF document text
    • https://ivanamihic.com/files/vulisifijadisurajagaxe.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/jevukub.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/lodop.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/45837298011.pdfIn PDF document text
    • https://zufiks.pl/uploads/userfiles/files/9163447504.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/37257566042.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/rijojok.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/80468763541.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5957531a2---dazagarebinefaxuvig.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/fidemizetubinawatosovav.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/48770560045.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d61bc03630---19694840926.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161458f8a47ac9---rotewazamipizakevizo.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/72169267361.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/75779876013.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/24050056862.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/52756225232.pdfIn PDF document text
    • http://abworder.com/uploads/files/ligegezesupadozadesedi.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/zixilog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=wifikill+apk+downloadPDF 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_off0000b081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB081 10164 bytes
SHA-256: d03d1667d9e29cbe97f28d9870e8ee394d97cd4df56ffafd62ddcdfd4b3b25b2
font_01_sfnt_off0000c753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC753 15648 bytes
SHA-256: af7d9e97877bac7998819b5c3db213ccdf84600646dca86664f4dbffa2923b66
font_02_sfnt_off0000eeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1