Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f561bdda229252…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 18:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e22adf1990dd6a6aa13c0ae299027c0 SHA-1: 612cc93f1f4d699e9e81cc2437c904199f066fa1 SHA-256: b7f561bdda2292520ef2aa95814556efa1838d2c0038ff33c1c1442a6dda707f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the PDF structure itself is weaponized to host and promote malicious URLs.

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://laborke.ru/uplcv?utm_term=excel+practical+test+questions+and+answers+pdf PDF link annotation
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/1fa5f248c3c0e67f3d4d3d467e80e2a7/13497487242.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/60307992541.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/34941102570.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/18941069507.pdfIn PDF document text
    • http://novichiha.ru/pic/file/xanakiboxukaxexe.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/070df538327795113587aca861962f0b/mejuxonuzuguxele.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abef7baa92e---25789547614.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/68107300907.pdfIn PDF document text
    • https://tavio.ru/files/file/mukumubutiwim.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/83749997590.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ac17d0799---mudatozusidewanagilozate.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/vukitisimud.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/81324561991.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/xunofipurofidava.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba36ef65909---29698548949.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30095629623.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160721d3ce12e6---rujepisigozavovotap.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/7364742471.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/moxajadukiwi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/9cerkq1gfgm7o9kgjamjsj838m/jugesi.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/15931543399.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/2657412e0fbd1034d33ac94746fe78dd.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_off0000cd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 16728 bytes
SHA-256: 9a4814837250a79bb4b8445f1558b2a9cf417bce5f47aa18a3a38830aaae59d3
font_02_sfnt_off0001105e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105E 11032 bytes
SHA-256: e221cd9ec5679281c4983144232ada63c65a60ba2077dcc17f7ac050a8dd3c92

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