Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4848c54344ca84…

MALICIOUS

PDF

90.6 KB Created: 2021-09-06 04:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e7f932a917e2cfe73967c1cb3c726f7 SHA-1: d2c2cbf194eda14d8e73652bba4c487a4041e742 SHA-256: ef4848c54344ca84ff67bf8d10ada39536130516ab7097856d3a9a930951e06c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, indicating a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://dztechfin.com/upload/file///xigenoruzojuj.pdf In PDF document text
    • http://biosurfest.com/userfiles/files/sobekepegugenab.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/momigixapadilulejitaxoj.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/lukipadojezuvimenodixene.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/segubiv.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/sogofisusiwibaz.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/gemekulufalovevati.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160780d52014eb---dapujizujurolupar.pdfIn PDF document text
    • http://industra.sk/userfiles/file/74594079472.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210811_143617_9030.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/xewuk.pdfIn PDF document text
    • https://fasaac.org/temp//files/ziralug.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/zararobuluxomalafel.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/37279825771.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/65750662549.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/vgom8c6g3h58pjb8f5e9oetc8t/kepojur.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d4638ca8be84bfc16e8faf6778b513bc/45966632765.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/5399f49dd10a8ddccdf827bbf5246f9f/laxetukarekamasinumepuvi.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/25189680704.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/990299d25db68dc90d5fa79181602095/72864828524.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/xelaromowojotimezegizop.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788eff36717---18133877055.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/e9d7ce8d62f758a7a359e0c6ee2e8090/71522317733.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/46859273375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=kerala+calendar+2016+pdf+downloadPDF 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_off0000f1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D2 22080 bytes
SHA-256: 9bfb5c973d23b2f3ab9eccda8a53a70942d407f2209338de3a4c0f3734b6936f
font_01_sfnt_off00012b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6E 10796 bytes
SHA-256: 9b923e026c9755be9d56f81abd40696186d5175e34f5ed39f84d25ad69d5ad20
font_02_sfnt_off0001448a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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