Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e30f7b6ff64af7…

MALICIOUS

PDF

86.1 KB Created: 2021-09-15 16:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f387ad5cf1ca62f5a233e02886563e27 SHA-1: bfa499d940c4c43bdb99f745cd7ae676c9119ee5 SHA-256: 50e30f7b6ff64af704a3a2d692f5c903cd705a0e73bd589726b372810781f76a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various domains, many of which are flagged as link farms on potentially compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nifaelectronics.com/userfiles/file/kikekitozokesarurademaper.pdf In PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/dilotigupamitomugoteboku.pdfIn PDF document text
    • http://epicridesnepal.com/files/kaxoxig.pdfIn PDF document text
    • https://euchebnici.com/img/file/78719099327.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/zolajimanuvonakijatuf.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/53760829832.pdfIn PDF document text
    • https://dm288.rs/slicice/file/gorupuxejut.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/lekofijujupevijukomomuwi.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/koxufatejirut.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/2249090263.pdfIn PDF document text
    • http://alvitraders.com/files/1256859989.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/1808d843ec5b3235697b417be2bd0b1d/mazafoxu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f59f892fc7---pumovirelogibopeje.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/tukidena.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/69152731378.pdfIn PDF document text
    • http://adriennemason.com/assets/files/ladatezemojobalixawotowov.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/mipigegofesomak.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631288814.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/21784712469.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419e1083786---18695435483.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/luwilelakalakati.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/dukif.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/eb97c564893b1331a9668ee008d09158/56840430701.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/22b9eb9fc6b19f85bf85e99c5cab138b/wogujujodememisubobato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=watch+nba+apkPDF 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_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 19032 bytes
SHA-256: 6e65b42bc790c022b2c3f03f48b0f3bd380e5bb2ad7944939f70134c34b721b2
font_01_sfnt_off00011d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D60 10036 bytes
SHA-256: ce152ae5f80b623bd08610d601789d3542b47c4261843843780b829ca3ebab84
font_02_sfnt_off00013368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1