Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d5f425e9a703e59…

MALICIOUS

PDF

86.2 KB Created: 2021-08-30 18:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b68fb44b7b2c112a04172694fe45bbed SHA-1: a2c88c1da518007bdd65d12232eebf06625f447f SHA-256: 6d5f425e9a703e5936abfc5c5204309ba8d96e46b0fe016cdca279953014ac6c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external sites, many of which appear to be part of a link farm hosted on disposable or compromised domains, suggesting an attempt to distribute further malicious content or phish for information. The presence of embedded URLs and the overall structure indicate a malicious workflow designed to trick users into downloading or accessing harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=arihant+sample+papers+class+12+accountancy+solutions PDF link annotation
    • http://daearesort.com/FileData/ckfinder/files/20210707_9FC928FDE0F975FE.pdfIn PDF document text
    • https://csn-alliance.com/data/files/gubagakitokamo.pdfIn PDF document text
    • http://acril.ru/ufiles/files/94904195489.pdfIn PDF document text
    • http://savemaxint.com/files/file/kitixilimafavikivik.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/vililefivom.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84ab329e0---31980755379.pdfIn PDF document text
    • https://krusomying.com/data/file/94450292616.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607da0ba59e86---zojewofotapimedumabewavo.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/latit.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/24028246665.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/d395cbf2fbce2cebcd8fdd75e2376bf7/darufaputu.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaaf8d2588---puvepoz.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/98349413796.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/51731593064.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/gososesave.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/57186450285.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/fabegufonobori.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2a7352cf1---91495570437.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bvknoe5o95rrl96er4sbplj015/26865506996.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117b2a2c263c---56850838094.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/10153813451.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/5c099a8c7ca2c76e7d545e1673ca1bf9/26151460808.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3039fe6ba5---vezumin.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d13f636feb---26899487462.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_off0000e9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BC 18320 bytes
SHA-256: 67978b362effc6537ae05d2c9eadc255b410f1e1aa62e70ac63a9a2acd0daa8f
font_01_sfnt_off0001189e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B5 11008 bytes
SHA-256: 57d8f52353ac2f06755ee01ff61f10140206ce3e3913d3b01feebacd1b4c50bc

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