Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6b9598c0010e89…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 00:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 207a7f1d7cf8343e4aae772e87b39479 SHA-1: af3269c9beab69d366a2c15886b207401b0a9745 SHA-256: eb6b9598c0010e89835e089e11a6f415ea81ca3922bac5e8eb32dad5331a01bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to lure users to malicious sites for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=traffic+going+home PDF link annotation
    • http://elisa5888.com/shopadmin/upload/files/64057620592.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b977e25b22---jivur.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/kaniwafedofawo.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/ropimudonuw.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/vawetugudud.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/51171967904.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e86aab58804---rufapo.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160852c194bc3e---foxafiwudusizul.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/50058643851.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/zinosogesepejigopidurolaw.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/68980542115.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609227fe6e006---60946418620.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/92343647182.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/83a53f60240891a87be7f54711d738e8/kimufobodasovetemo.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/woruxegopufi.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cd6793663---robunedumizevamavut.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb5a28224---74176217393.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/1482531257.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099b14f82386---70564245270.pdfIn PDF document text
    • http://gibisch.org/files/files/pelufazasojarojesod.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/cfc81d1e061d8a78686b8f1fb1d68767/luvupifekaluw.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_off0000e6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BB 19144 bytes
SHA-256: 915f2767a813a280a29f890d0541baba77e4217b1e6e496c8315918abf91c8e3
font_01_sfnt_off00011850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13067 10436 bytes
SHA-256: e17f04c0572fd6695cf534b849c0f75e6c254318d63f24efa071f3eb4d40fca6