Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afa04ee63431aea…

MALICIOUS

PDF

95.3 KB Created: 2021-08-08 20:40:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: bee3743201fbc4437b31b85f379acc07 SHA-1: 194484308a1b66352649c8b88f2b7169b5f6fc1d SHA-256: 7afa04ee63431aea04a594197c54b0ee05e471f1e33843ab15ed2175d1e58013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://bodegaadrover.com/userfiles//imagenes/voganolibipo.pdf In PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/zapetebogugajakagod.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160773cc04ca79---mipojipi.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b963eb0a299---63907831548.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/jogufekavepamelupakulel.pdfIn PDF document text
    • https://cian.hr/userfiles/file/39405122322.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/faxege.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/kamut.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/km751c61a6seef1gjks1he71mh/9347681885.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e91a6ad614eb1d47f68c3bcb5d78bb7b/70249718442.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/mezajabivazufinag.pdfIn PDF document text
    • http://allasclub.com/campannas/file/zidemigajal.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c038fb5d4ec---65468922436.pdfIn PDF document text
    • http://wallawallahighschool1968.org/clients/75819/File/70983400112.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/dekosilixatakokiwawipi.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/a9fgafljv2nqmuk5d0fk4j8oqc/29653944733.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/fegeger.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/nuvuxowefozi.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/zaxos.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/40649090765.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef8e80285c---72770995319.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/93245435947.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/38424277760b84e9b1acb0.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=3+ejemplos+de+narrador+testigo+cortosPDF 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_off00010c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C81 18448 bytes
SHA-256: 56afb9b020b0ad6d2a0401a30b7c044e06b1047d55a0aeaf6a6540f8071302d9
font_01_sfnt_off00013bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFC 11064 bytes
SHA-256: 651cf673af8295bb1fd8f99fe534c43bc12bbb6ebbe91aa45e1fe4f5861ac7af
font_02_sfnt_off0001557b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1557B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1