Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d43f3ff21e73e2a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 21:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 2ed3de5e76ea61778f7c944352007a01 SHA-1: 3ebf1de7aaaa0589af9657d33790c6111b6995d8 SHA-256: 9d43f3ff21e73e2a374025127424482faf2c1e2ec830eb0888bbefeb124f0808
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farms hosted on various domains, including compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The presence of urgency lures further supports a phishing or social engineering attack vector.

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://coretry.ru/uplcv?utm_term=ark+survival+evolved+free+download+apk PDF link annotation
    • http://pscworld.eu/ckfinder/userfiles/files/xufawama.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/51179557183.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/vemuxixegi.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/govaporad.pdfIn PDF document text
    • http://naviway.su/upload/files/72712857135.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/gefipovokaxi.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/xojise.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/jomameso.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/telogegozawijo.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/pamezukuw.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d41994b9e9---xabukod.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/gogutiz.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/goxudonet.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/27157239593.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/73572868518.pdfIn PDF document text
    • http://someteme.com/archivos/_20210907115223.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/nedutizaduvogejuxam.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/96320671035.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/piveziralidepevokuwowofu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613c370dd4134---94971597158.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/fusizezumumefigatagam.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/d41p6nrrmvv2d3rgfvpgkrs0d6/fiderajuwopaxolobef.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/basepuwabolew.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/vowefok.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_off0000cfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD3 10720 bytes
SHA-256: 24b35944a0a385c1b369b01f81ac7c02991a0a313e7a1c02ac23a2fe75f7c0a0
font_01_sfnt_off0000e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 21672 bytes
SHA-256: e6a909951306bd3760865a590271507a6b480c3862de8f890ea43cd0d9b90d99
font_02_sfnt_off000120fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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