Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2effca5ac998dae…

MALICIOUS

PDF

100.0 KB Created: 2021-07-02 21:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7d6f21c0d790c708ed0e1ba41bd5eb96 SHA-1: 18c7923c6f47214673594c1b941f41df4e1f0a75 SHA-256: c2effca5ac998dae2d88f498a39d42456dc0e0391ded5e2e154c461de4e2ac78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://chcial.ru/uplcv?utm_term=electrical+installation+and+maintenance+teacher%27s+guide+pdf PDF link annotation
    • https://fceresources.com/ckfinder/userfiles/files/65978078767.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/91897068127.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210604003719470767.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/batopezujexu.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/6434b634d1faa34c17c8f0ac0538fdb9/fimewulasixinobifisufipo.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00677d3507---rukexarebepivasomawep.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c154e6070---47018984310.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/33681463052.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/2252427861.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-9/20210509025021338419.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608d88acb7074---tubebajosafubumokejodut.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c6e66d3f13025f7c1c14459c96044867/tavipati.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/f66gj93ep52uvggjjt41ni0dus/71600195563.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/evbmd7k4jqe7ldma0nndt8gtsa/55792479127.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607262d035065---76040932497.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/37961646231.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a2f03a80c6c35fa4c0c3835fceb18e5/kewodeko.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/3a987c3e68f89c521f4502fe7fec6cb7/jufanowipaveziru.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087da05dbaca---vamapexem.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/91103895803.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098c080daf86---ludigadowikafe.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090c6613ecc0---zukuwuxalilevedijos.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b29e6ac92e0---jureleside.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/0emohqqqk22doe0j36vmh3qf5k/21575954940.pdfIn PDF document text
    • http://apcmagon.com/userfiles/35529278330.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_off00012444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12444 16868 bytes
SHA-256: 12d3ae0666c7b8d97863626b18bea17382a2964e9c24df33aaa5d91b4cabb4fc
font_01_sfnt_off00015036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001684d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1684D 11184 bytes
SHA-256: 088b689b4bafa1af54ab128bdfcee76f0b076ba47fa341019c32ac9ced84cd57

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