Malicious PDF — malware analysis report

Static analysis result for SHA-256 439d1fcc7f8053bd…

MALICIOUS

PDF

80.6 KB Created: 2021-10-07 11:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b826c74339a455050dd6649251a1cb61 SHA-1: d30fba7b9591966e89d294e34fadb3d10573c694 SHA-256: 439d1fcc7f8053bd87dd96eb91a2b6e4035b0ad943723d62c21c2cb26bddb63b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for phishing and a high ML classifier score. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm characteristics indicates an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://catamma.ru/uplcv?utm_term=describe+the+process+of+crossing+over+in+meiosis PDF link annotation
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16142518908a27---389908390.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210923181316.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/5nka6v32803hvpp21383kh6pmh/10050299473.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210923041411446214i59g7afgzg5x.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/17414629135.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/62373649208.pdfIn PDF document text
    • https://materiale-parchet.ro/fisiere/file/13639598294.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/depato.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/wizotoliva.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/68113933994.pdfIn PDF document text
    • http://rentator.com/uploades/fckeditorfile/pizuta.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614ddcfa211d1---dimudedukozixu.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/48416675089.pdfIn PDF document text
    • http://kezmosas.hu/files/file/tixokamedav.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/23925099979.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/bivurejene.pdfIn PDF document text
    • http://grafitym.kz/files/file/44228570812.pdfIn PDF document text
    • http://asustainable.com/global/file/fetasupujuv.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/57489654696.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/vavopezevekide.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/jepoloxa.pdfIn PDF document text
    • http://wamer.org/userfiles/file/73860599030.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e1a7f13ecd---48746198746.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/gijuvemegosodo.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/53160937350.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/28592891563.pdfIn PDF document text
    • 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_off0000d7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B4 17276 bytes
SHA-256: 004ccfb64b5d6443581c8fda53e7f20d245d079f18e9e2c5b387048c4c0c4cb6
font_01_sfnt_off0001038b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA2 10928 bytes
SHA-256: 02633356fa6851674aba89522dbec42b6b2b20a6bea3fcc493688689a43bd05e

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