Malicious PDF — malware analysis report

Static analysis result for SHA-256 734435b51d88009c…

MALICIOUS

PDF

80.1 KB Created: 2021-09-02 23:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01d9e203aaef07470829293a43b64675 SHA-1: 111ecb2976e63365d40660f5f8f2a0c9d8672e1d SHA-256: 734435b51d88009cc8da381d30de4b75e118be9544a963c04fa140f46242dc84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the link farm nature of the document is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/ak0a9osgsdtt4bt77413h87ndc/xidozapisuxijomokejapo.pdf In PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/daseginadugid.pdfIn PDF document text
    • http://stpatricksreunion.org/clients/84553/File/xutidukibobigajevijog.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/jated.pdfIn PDF document text
    • http://mosjob.ru/images/file/bajuf.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/vepeme.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/46604750293.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/fe50067550a80606e695b66ecb5bbf79/68398301996.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/64410300407.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/45296131665.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/57506556601.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/af61a9ae73445db3fa11dd39a446d41a/69145628970.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b119c682---dixigojaw.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/fa01c3b36b3eb40d9a5359ea8ac2e052/piwutekusalaramuzadumija.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/rerotuwajapejedigu.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/24063906643.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/17844646027.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a094c993e54---mumowunepolutinugep.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/zanivi.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/nelavew.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/iul11o1qd5s8b7063j96o7b4bh/13083823812.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/dofuzimimupupaluf.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/segikaleruna.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/wedubudejisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=simple+budget+form+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_off0000d76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76E 10724 bytes
SHA-256: b4d89c5e73fd2ce2427540585ab7d7ce6f829b920f7851e7fa51bab60fa37196
font_01_sfnt_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 16924 bytes
SHA-256: f18fc7c6dd0a53b4e12f028d7dd4d765da460710e77eb14a821c575bdd78a818

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