Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86fb45364efb014…

MALICIOUS

PDF

72.5 KB Created: 2021-09-19 15:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: efd6d378bcffda7d8b282d4f7aa8f9af SHA-1: ab672250248db1e789c54f0a5d03b23f16bfa8b7 SHA-256: b86fb45364efb0145ddee56abc456337ca9f50f3a0aef7e168d54c7c3334fb8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress upload storage. These findings suggest the document is designed to redirect users to malicious content or downloads, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • 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://garglob.ru/uplcv?utm_term=screen+lock+app+download+apk PDF link annotation
    • https://girl0229960192.com/upload/users/files/22003217274.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/42094568520.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/37889824641.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/biriwixevudofo.pdfIn PDF document text
    • https://value.ae/userfiles/file/lozajufugujolobo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141c27d994d2---kexetakelojexiluxa.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/36354705545.pdfIn PDF document text
    • http://poiskvod.ru/images/file/56523170882.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/xadage.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/44359370636.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210909_B03F4363D0EF3CFE.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/fabel.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/97759277281.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/kanasigodideniravapu.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/44210962646.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/dadazuzepafawikanug.pdfIn PDF document text
    • http://creationart.hu/files/file/maduzugasojujasodamaravov.pdfIn PDF document text
    • http://bulmarconsult.com/files/98282061175.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/2734685282.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/89504011188.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/gabopipozikanuma.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe26b8faaa---wunorasotitilorilakopaxa.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/8229847238.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/51688577607.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137604f9af1c---bobafi.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/30120158825.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_off0000ba14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA14 10404 bytes
SHA-256: 2ee4e5dee9960cc113330c518b7f3483b97e1faec5fe01740b6f2a14787bdf03
font_01_sfnt_off0000d1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C7 16644 bytes
SHA-256: b4b889b00206f2a4967b59541e4ac6e7ca611a3251cfb735c6ffaa22b179c41b
font_02_sfnt_off0000fc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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