Malicious PDF — malware analysis report

Static analysis result for SHA-256 15cbacd2728a0c0b…

MALICIOUS

PDF

209.3 KB Created: 2021-06-30 21:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7cec7f662a9bc71cec5990ed2226602 SHA-1: 743e00b5d1c0ef27db63be8bc44ab31d12453ad3 SHA-256: 15cbacd2728a0c0baa7d96ac39bc86db7e84cc63f70f79169e0448cbf478abaf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

Heuristics 5

  • 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.
  • 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://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/2825b28cca126af2ae017d017ba225b2/bodaribigakorosevesoza.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b161bc8c767---lulorig.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/fugeg.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/74522464705.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/80331151452.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/a51a380216afe96b6fbdc1cb03e76db7/vekerotomonugema.pdfIn PDF document text
    • https://birudongker.com/contents//files/rifiwuxugonepunuweladuza.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/51041856707.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6c9188be2---zatejogikaparob.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/dde1d44b6d4bdc15cf147cd5a0f705e9/82196588715.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15e3f3d750---89547418668.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/pamuwufibe.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c55c1d62e---lofusuwuwozolexulo.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ade1bed9779---33954080959.pdfIn PDF document text
    • http://yoron.net/up/files/sizobamara.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/la9l9v3so2jojp50obbmdedi58/rimozorezizodonajuv.pdfIn PDF document text
    • https://tipresentoio.it/images/file/39729058159.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c658d301862---pudirekozar.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/wirefij.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/madaputasu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609638d89d5d5---vitozigajofazuzi.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/kejolapivatuzujuje.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/9077995217f334a88ed83f752f379d89/revuxafoneselomobin.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/finufelunemutemeb.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mififiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=the+environment+protection+actPDF link annotation
    • 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_off0002d362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D362 10452 bytes
SHA-256: 997db84e89f079cf52261fc61a3871622f0da431615fdb4f4b6022ce11ab5597
font_01_sfnt_off0002eaf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EAF0 20032 bytes
SHA-256: 2ce9c9a6374d8d032b90714431654e5cff701415d8bb14fadbd875ee5d35041a
font_02_sfnt_off00031ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31EE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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