Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f411c9ff498191…

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 16:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ad5160ac8c88f66f566ef246ce39cc6 SHA-1: 23f1199874d134d99feaf53e44588f9b92c9c51f SHA-256: c3f411c9ff49819150dd60c1377763ad592f0c3154fb717e9c727203bbc0661a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/6fe7dd0e339492d72bca96bb36f388c0/lopetasunuwodazako.pdf In PDF document text
    • http://orderkai.com/uploads/files/88171746710.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/wowatu.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/kanomi.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/nijulitadetipunividafax.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/zazetufemijifilaw.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/95132217495.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/zerekumiwunarubupojijubum.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/43247649563.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/d33467c51312a6bc24d6824fd40a7a4f/31841712621.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/paboxopijazuwazizib.pdfIn PDF document text
    • http://artio.pl/files/files/25895524442.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/18626008003.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613143c3b0fab---31386665944.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/57940900199.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/resupol.pdfIn PDF document text
    • http://pvvc.cz/files/12118057275.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388aa8a13a1---balasesediwawejidovadu.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313eef3f52e---kuguvapenetegagijavomupaw.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/31493170260.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612efb1d364c2---jesipi.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/manubakowizijesa.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/zudavixarudetodukamu.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/41089363011.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/jiwomo.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/96010311003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=adb+driver+xpPDF 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_off0000d560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD560 18588 bytes
SHA-256: fce9107dc709f2c4b0634cd2ead547150048e035e16c7bd465ce4c4abbbbb6d8
font_01_sfnt_off000105e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 9976 bytes
SHA-256: 1578e02b356f2a8a11a9350a12625f66c4ad8e37b202beba6d00306543347583
font_02_sfnt_off00011bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1