Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f61383e78160b1e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 15:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2e03ec31b69371a64ac63a98ceb9a71d SHA-1: 7d1b79e6c232cdf4c26d7c63f1124c8a2ff0fd7d SHA-256: 0f61383e78160b1e3614597a0118884329ca4c3381b8e0981a0ca0a765414c6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites and disposable hosting, indicative of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://circuitvietnamcambodge.com/hinhanh/file/rijuf.pdf In PDF document text
    • http://cw-cut.com/uploads/file/nolimosavapepono.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/51646519454.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/zinuwepulidemaj.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/30552326584.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/gegevikoveta.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5f420a3e2---vifilewenunugiwonasegi.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/um4jq175logkr958pndog8pgei/waduwulemefetadoka.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/174b3cdeb5bcf20573f7ec1b28df2f8f/fawurot.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/84530996823.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/90257892669.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/moxefimoxadilexarotap.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/lukikarukotukuzesirisavuk.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f5f4c59b0---33588645354.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3185d964a---25688056469.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/setoduzamowubuxoviradiko.pdfIn PDF document text
    • http://ccadl.com/files/20210902082740.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • https://skvacations.com/userfiles/file/liviperevuverede.pdfIn PDF document text
    • http://csc0871.com/userfiles/file/20210916175719_46y1wp.pdfIn PDF document text
    • https://tadimtursu.com/image/files/35582741828.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/14449087897.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/semuxejeworut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=love+last+forever+ep+1+eng+subPDF 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_off0000d3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EF 10756 bytes
SHA-256: e6c0b556c576a812d22525300b45d08d8cb925f7e19881ee85fa2f687427a4da
font_01_sfnt_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CB 21288 bytes
SHA-256: fd730e81038e31d5accab632ad48c6be8f53b0b8f8e6237416ba969d92440b6e

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