Malicious PDF — malware analysis report

Static analysis result for SHA-256 92cb0c121f49deb6…

MALICIOUS

PDF

74.0 KB Created: 2021-09-05 21:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3598b497fa48dadea35a4df00fd3dbac SHA-1: cf00ef97027855a612ef255940103be2cf69763d SHA-256: 92cb0c121f49deb66edbf37cc69acdb768b54e3a4b3fa21adf78fc6e6c0e77de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites acting as hosting for other PDF files. The ML classifier and ClamAV both strongly indicate maliciousness. While no scripts were explicitly extracted, the structure and link farm behavior are characteristic of phishing or malware distribution lures, often initiated via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/ad65c7ebd6223844ccaaf6e91af79e3e/dimotusarolufunevo.pdf In PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/kaxupiginaleponutaro.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/n12gutpb6gu46ue8cg79dpi9bj/81299567545.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/dd7d7ab638ca1e85e2bdfe5a987ba10b/fevajimomowige.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/e4vjqvof6j0o0pvkgb7id9j87n/zebofewilebiguxekazozaw.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/filujogakigun.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/95871464268.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/xevarabejadopir.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/43942046492.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/tnrjp4us7qf1tp65kp6ici16r7/vufubifovewelupinagoponop.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/44854171505.pdfIn PDF document text
    • http://pnalog.ru/images/file/vabuvipuvositowepela.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/54841933447.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/pugubewubofunibi.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/genizakujosajejefulale.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/87907620782.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/lowepisujojizifilerajaru.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611acf559f9b8---sikogomitab.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/29ff12da31eda267ed66c6015e636629/bulixowob.pdfIn PDF document text
    • https://successalpha.team/upload/files/wekifo.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/16440028057.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/nozigibadamesorepixese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=delhi+district+court+recruitment+2019+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_off0000ba05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA05 11288 bytes
SHA-256: 5e22bac2c7b1c6784375a2b96c57fad4212a96b0fbc76315c38b76a98644c0e9
font_01_sfnt_off0000d467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 17492 bytes
SHA-256: 25c6981b675fd0f3f6377869585b290b894ed1475ef7c6fd07c4da81b8e4eb71