Malicious PDF — malware analysis report

Static analysis result for SHA-256 809befc3a277150a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-12 06:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8b16c8f4a2879507bdbf05d1eea59fe SHA-1: 61af37984a85a86c7b97905a3d792c4ef9bffc31 SHA-256: 809befc3a277150a3af0a3539dc9f6730799a8fa500d9dc8f3bb84f02bcc8422
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, a common tactic for distributing malicious content or conducting phishing operations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://clubslotalmatriche.com/calcas/file/zojukekafanugudaguzogimi.pdf In PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/25466300057.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/furosuxevusokak.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/1977466936.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/a1fuhhl511tmr7vh3fmci4hp8o/rufowijexavodumekurixeg.pdfIn PDF document text
    • http://pasted-radio.de/web/files/wuwugu.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/pusari.pdfIn PDF document text
    • http://arablift.net/userfiles/file/kapozofirokedivemitome.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/n9vc20rnartobaq4odmvaj05sk/raxirejubinewerige.pdfIn PDF document text
    • https://trexanh.net/upload/files/25247947732.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/013f1b31f425161202478510caf2eab7/lumofumemelex.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/13218325495.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210905105155_1227063318.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/xeniwapifuvefam.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/86934696108.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/zepazu.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021951833238361.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/23779804764.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161395db8c4b04---vegunipiru.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/32303231735.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/bufinadalizusozajitotib.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/muxiwekibepavepega.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/fuvesosadawonebenev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=speech+to+text+apk+offlinePDF 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_off0000e2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 10580 bytes
SHA-256: 819ed3bebe80139d5aa30bc6882b1cf213a03f0064d3e94587a32007d622814d
font_02_sfnt_off000112f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F6 17588 bytes
SHA-256: c74fa0ccec240d284fdc05a63ab2bb15c487d5fa7731b08089bc411fa3856542