Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38f62e4ccf5ec13…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 12:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c853001de0253c83626a7247a3785f5b SHA-1: 7ca5381b5dc052e3db4ef80025c9eac95ebb9575 SHA-256: a38f62e4ccf5ec131433b28b742b9e385f5b1e2ddb6294be7dfca79f9002c5f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=where+can+i+see+who+viewed+my+instagram+profile PDF link annotation
    • http://iswii.net/ckfinder/userfiles/files/78548814318.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/92604958058.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea962cf2e4---29562298868.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/gamukedi.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613244b520a8e---92778037665.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe3b1bbbe---79425554386.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/95413894490.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/20488764194.pdfIn PDF document text
    • http://holzbau-napetschnig.at/31893684688.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/kegilavimikadi.pdfIn PDF document text
    • https://tckontrola.hr/files/givodanulif.pdfIn PDF document text
    • http://arablift.net/userfiles/file/36829801924.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/nuwikebivudokag.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/2099402657613d28f484646.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/jafof.pdfIn PDF document text
    • http://tiquital.com/documentos/file/muxebarimaxoxuponarudiv.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/84441147115.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/16188838181.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210913231144.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/fobevukaw.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/79143907507.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/pewukemiwexezaxunuwezez.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210904184634.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/jovutupixenopakij.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_off0000d66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66A 11328 bytes
SHA-256: a70991fe9e101922044c4c99b32b70e28520b80b090cb4279d40cc2e88d631e3
font_01_sfnt_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 17468 bytes
SHA-256: 69d277c0807a65eaec162db203a1c6f29b8fe0fbdf08673c4b63175b977c6ad3
font_02_sfnt_off00011e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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