Malicious PDF — malware analysis report

Static analysis result for SHA-256 317f856c6d1ff627…

MALICIOUS

PDF

92.9 KB Created: 2021-09-18 16:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 987efad7972a55d1e886ebdd29e7751d SHA-1: 27e6807c59c6c62e46ed8d9b2cb393522a904617 SHA-256: 317f856c6d1ff62794200b21dd2b36f7ca948798db9de09afba61d2b516b1371
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or link farms, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term' in one of the URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=great+ninja+clash+3+mod+apk PDF link annotation
    • https://medius.sk/userfiles/file/24436118107.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/vororajipijomalusozawisan.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/jowit.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021991735178849.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16130726cc01c8---gokuxir.pdfIn PDF document text
    • https://quizai.com/uploads/files/noxafudeleboduzubakuba.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/rujedilosubiwo.pdfIn PDF document text
    • http://dongphat.net/upload/files/67480761638.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/19809336983.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/zikemarilur.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/37261564946.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/032ut1e7thjmirom7372dknr4k/lomeda.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614577e9ad735---57292203064.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/56818436737.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/zufoguzivofupuvevuv.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614239e823fcb---20256379354.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/16421540836.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/19999184328.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/572890678.pdfIn PDF document text
    • http://imi.vc/upload/files/junin.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/mopewaruru.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/94287952931.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/83231981558.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_off0000ff6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 11212 bytes
SHA-256: 46492028017883ba72912f2142fa235d2c02d550910cb7db4c2d154d7100bddc
font_01_sfnt_off0001197d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001318f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318F 20376 bytes
SHA-256: 19374f8600425db9842156ee20b3af223a44f7e99cecd0f728f9f763584c9605