Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ce2b2f5827e402…

MALICIOUS

PDF

90.8 KB Created: 2021-09-19 02:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5d1f59208cc899a3276b5a6aa3132025 SHA-1: 9e4861cc36a4c080c829b11e14a74857a3cfbecd SHA-256: 79ce2b2f5827e4029693dd2f46875251286dc1dd9ba1f58227b8fcc74bb98bf1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous URLs were extracted, many of which are part of link farms hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=indian+idol+13+winner PDF link annotation
    • https://hankilfood.com/upfile/files/24910675050.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132380a30cfe---bugumobudekibabowomapanor.pdfIn PDF document text
    • https://bfull.ru/uploads/files/fuposafupogifirafetesekor.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-14/20210914071036367229.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/28685874426.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/11197627194.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/bavixedagabo.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/83186593432.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/2109060004513400436v4or.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/padozudusiminasokesige.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613688ec3712e---87703670641.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/pamalevejizav.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f94c0c25e8---nasogiravexulo.pdfIn PDF document text
    • http://topp.pl/_topp/file/zigiwuvama.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/penuxalopexobuxenadajewe.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/wozivarir.pdfIn PDF document text
    • http://caythuocnam.org/images/files/bokogipogedesoxigaberulo.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/nanadamam.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/tunebomupixekogok.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/powudejojifu.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/25638833623.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/43992008100.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/56464989471.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_off0000fda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA4 10236 bytes
SHA-256: f6d29259006426eaeaa0e9364dc53a82789885b077826eaa94d3abb6c07d751c
font_01_sfnt_off000114c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C7 19076 bytes
SHA-256: c765691522c36c8ceea613b025662d9ba223a4ec8298c730174086d2af9b4684
font_02_sfnt_off000145fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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