Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f0f3cb07531e3d…

MALICIOUS

PDF

85.1 KB Created: 2021-09-02 16:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d41d1f766a15d04c84092f36c765b44 SHA-1: 8e38315227e61dcf27d2908cbb8857727ab0ff50 SHA-256: 65f0f3cb07531e3d0a6c73236047ccbdb38ca8437c76dbc1a8473bb42a26ee49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that utilizes a link farm hosted on disposable domains to redirect users to potentially malicious content. Heuristics indicate the PDF is designed as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://www.niziointerior.pl/upload/file/laseperafarupaf.pdf In PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d9597cd62---66430516891.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16105158e96a2c---93330579958.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161208fe4d5e56---95703810343.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/60821500378.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/97968479904.pdfIn PDF document text
    • http://staropolski.net/Upload/file/57803490556.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/vopifunuxew.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/foturodogudedizavonidux.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/tekaguz.pdfIn PDF document text
    • http://cga82.com/admin/File/judutovitabuwedigomiluf.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/o6n9lcrlo0qj848pdt9bd7a3a2/79828376866.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210804043630203404rrzzim.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3d921a78b64edcbcaac44de7d73a86db/sipexikibusogizimafiloro.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb239e5ad2a---23321612514.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/12082192882.pdfIn PDF document text
    • https://komodovo.ru/upload_picture/laxadurojufikezopaze.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b90567a53fa---60654707438.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/93245723211.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610958a2bf5f8---buxiruzumoja.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/28198589506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=gpat+question+paper+with+answers+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_off0000e742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 17872 bytes
SHA-256: 292fd15eed38c9c71f73218d385b1b8102ea492873b51abfa852b5f7a2c86b2d
font_01_sfnt_off00011603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1A 10920 bytes
SHA-256: 706ba1d722f1aeebe287533b54579c3e57611402fc5030d372849444b4dfdb8d

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