Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f077e1b837bbd0d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 18:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2059a715bc8165f43789f09fcdf0c088 SHA-1: b36549b51297fa9af5f0a72090bd9afdadf95ca3 SHA-256: 6f077e1b837bbd0d0e65d11e58461879c1ddb67b633c1d9e930d7e998a4bc291
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to trick users into visiting potentially harmful sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=manually+uninstall+trend+micro+officescan+client+11 PDF link annotation
    • https://luatsubienhoa.com/upload/ck/files/jedojuboworiwuroruxafiv.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/mafarinamijider.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f498cdd24---kuvilomomiberafa.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/miwupil.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/29847301867.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/lufedemuxebuzatikifidif.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/40331140702.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/4719341489.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/futaroluvubiporetepat.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210902/file/16305812793259.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/kekuzupugigepatosexajir.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/nuxodijodup.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/83430922000.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/76677914336.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/loxelevawopode.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f62efaeb3f---29065072078.pdfIn PDF document text
    • http://wernitznigg.at/files/kodev.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090404483273499.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/95069110942.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/sezavoz.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109052150532742.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137fca3483bf---6683437037.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/fesikuva.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136819b06071---56349416547.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/10377003774.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_off0000d6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 10896 bytes
SHA-256: 5ac1d05818c373424b0acb0e06f67f01b10bbf48feeec36b9b50be5867e2b176
font_02_sfnt_off00010800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 17356 bytes
SHA-256: b53b8643c8855ce646d15e5431578f98ff23aaec6b892bcf8d6d1d2925666344

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