Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b90390b8085b063…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 08:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0ac1378e8a0606d289b8c5fa8d167007 SHA-1: 625f00ef1dc541134680c731c8600070c3f7b326 SHA-256: 7b90390b8085b06303c18670f06e9ab25c365c49668b43e4d52baf55abe11da1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded JavaScript stream and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, indicate a phishing or malware distribution scheme. The primary function appears to be redirecting users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088dbf634203---joximusofenumiwe.pdf In PDF document text
    • https://warungmimpishio2.com/contents//files/vakuponaj.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/44fe22cb859b3396d66a438d1e96042d/17622587180.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/5b33908d25d773666fe0b2aba819025b/rinexa.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/56031278728.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/prde9r3a5bdbet7bi5oucbm017/sovefuzusub.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072394d6ab49---jorolo.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/47073220130.pdfIn PDF document text
    • http://jakspravnenapsa.cz/userfiles/file/6792919721.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/sosuwedigelurosomuz.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16086eba6c99b9---rivibodebokipod.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/35412952063.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/bazovuwibesomefo.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/funiwanimerupofuxejude.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c41ae90af---liweduriwulujise.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/c1a1b365725b9a9017c616fcb8422e05/nenepemuvo.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940ab879ea9---wibogoxolajaj.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/60763717432.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81009551017.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161135013d766b---pezamejelizobuwelase.pdfIn PDF document text
    • http://landpas.pl/upload/file/16346196208.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/84521446912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pengertian+stratifikasi+sosial+menurut+para+ahli+pdfPDF 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_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 16928 bytes
SHA-256: ac666676cca09bec7c2b10a8f9e7bdbf3456ade90ed2489db178fb9fd7f87c6d
font_01_sfnt_off00010daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C1 11140 bytes
SHA-256: 68f9edb62b9834ebb3ade2876e31086036caafbe17604316937b1a2ba3ed9cf7

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