Malicious PDF — malware analysis report

Static analysis result for SHA-256 c616747fabfed5eb…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 12:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 776f174701df131bba4a1ba0c81b3b31 SHA-1: 15d04422177e3a35a7b089b3d29dd09ad77b7670 SHA-256: c616747fabfed5eb5e02b372767fce9bbf10e9597c56afc9a5e20d2a6557ad4f
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a tactic to distribute malicious content or phish for credentials. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, further indicating a malicious intent rather than legitimate document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=delete+photo+recovery+apk+free+download PDF link annotation
    • https://gs-hemeringen.de/ablage/userfiles/files/86505566063.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/liwabodur.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/zetubemirazurun.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/wowinawadafe.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcabcd91cb---18538136371.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/nimepen.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/podipazos.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/xosawivilot.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/31184485192.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/u89rap5ehdpvro8p4jvqv33404/46889034578.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210908_C08CD198C1248C53.pdfIn PDF document text
    • http://irinabailey.com/upload/files/83951410603.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/5515681742.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/13645667948.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/kizidokiwipurasepemuma.pdfIn PDF document text
    • http://boxethai38.com/upload/file/wonubofujararima.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/lugogefonebasajegonuf.pdfIn PDF document text
    • https://ms02bet.com/contents/files/72739941083.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/vumepinofodobobakaxumij.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161319c88700e2---pesirejemubifelafarit.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161386649337a9---xujetobamexatajojopimi.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5fd7a1a50---rafubopix.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161353bdc519f2---20923640882.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/zolewu.pdfIn PDF document text
    • http://oris-am.com/editor_up/13610138487.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_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 18396 bytes
SHA-256: 93a05f2e1435f7d7574be8329fc0c868e07884e40c662511c6be21baca37bfbf
font_01_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 10816 bytes
SHA-256: 97f0638dcd93102aa0271c1fd50fefa6e6432e8d764328b0754a74ba0f5a2c67
font_02_sfnt_off000123f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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