Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2a0b1850e441f3…

MALICIOUS

PDF

93.2 KB Created: 2021-09-20 12:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77d28b00460b8599709645ff3d01ab07 SHA-1: 25b886e614cf92324f9444f33a7a6039359c068e SHA-256: 8f2a0b1850e441f34b1e5f48d36a271478a36f088f7c8d01cbf605675d372ef7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the download or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://philabc.ru/uplcv?utm_term=shoe+dog+pdf PDF link annotation
    • https://safetypadlocks.eu/eurostyl/photos/file/15965357545.pdfIn PDF document text
    • http://contua.org/userfiles/file/valaw.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ac955ea128aa0702e3edf5d22987bcca/riduzimamazubukakogesito.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/tikelig.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/detezewoxilad.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/59279848499.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/20/45123664167.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/78629673888.pdfIn PDF document text
    • http://strandedtattoo.info/file/57111438434.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161331fbdeb57b---66555912030.pdfIn PDF document text
    • http://screen.by/images/file/boruvexiwiwujefidabosi.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/xipivevew.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/felen.pdfIn PDF document text
    • http://xycrusher.com/d/files/xubegutijal.pdfIn PDF document text
    • http://vln.nl/files/file/tafipulotovaxavedi.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/44240238489.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/vulave.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132669346ef0---kogiv.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/zojewamamesabofa.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/57cb5bb43387cd66da1762d096fd75f5/juxugewa.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/8845246458.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9ecec2fb2---94922306578.pdfIn PDF document text
    • https://austarpharma.com/upload/files/menelutubafumikezuxinalu.pdfIn PDF document text
    • https://ottopianos.nl/files/militobemijugexagiwuto.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/sidujupeto.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/21695588812.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_off00010bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBD 10084 bytes
SHA-256: 721f301988a083935a67275c1f0c31f9043950c95bf00fd148b3ada468d1fe46
font_01_sfnt_off0001221b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2D 17496 bytes
SHA-256: b850fd2c639eec94aaf9044e752b2edd8e1da1fb3d0bab636966f0cb851e7619

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