Malicious PDF — malware analysis report

Static analysis result for SHA-256 b522d13780d9f08d…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 01:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a79f48d80360991530f3d35e645fec7d SHA-1: ee4a3667c41488c999f5fc5653bdd9c8a4b424cd SHA-256: b522d13780d9f08de6a556d7bf3c3884dcdc6d601a1db12547290f82af148468
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The 'SE_MFA_LURE' heuristic indicates the document is designed to trick users into providing sensitive information, such as one-time codes or MFA approvals, consistent with credential phishing. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://queure.ru/uplcv?utm_term=wifi+password+hacker+app+download PDF link annotation
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366a937777d---22862807997.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee9e9978ae---nifulenuda.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/1910328856.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/81560747207.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/53348721525.pdfIn PDF document text
    • http://underbutter.cz/download/foto/41176893437.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/mumulekukakipuvubij.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/56118942969.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/50779800006.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/sajujegijowom.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/ot916r90vktg6khptmoquh7go7/gevoruk.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/64877754006.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/10654676096.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/91192204327.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/h0rr8u15dvgj7i8030ce4ts104/57324773529.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161306afc68a7a---97885222522.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/kapatizilufuxuraxapaxom.pdfIn PDF document text
    • http://simoncaulkin.com/images/38268553345.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/molewe.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/janizarigupitunuzefu.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/fotisiwumawawajeredur.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161450c2d546f5---76494477473.pdfIn PDF document text
    • http://chinahongji.com/d/files/25217513862.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_off0000d40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40E 10792 bytes
SHA-256: 0864898d117ff85067979a36ddc027aa76886fcf71a335951ea3bd3037ee9388
font_01_sfnt_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 17560 bytes
SHA-256: 21be0fc3a4d4428ccee4136ad37e2743275ee76c0e12d2108220d4120c487ed1
font_02_sfnt_off00011a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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