Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c82f515cf152646…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 04:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f931a333b15f35a0b820a36690186630 SHA-1: a92644f7650da19781d1ad6a16efd4d7dec992ef SHA-256: 1c82f515cf152646efe1539f39fdb6ee06ea9dbb3e355db4a8dc0ce70cb21799
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirm this behavior. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=watch+big+bang+theory+online+free+putlocker PDF link annotation
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/8275e8de8912acf0c5cfd1e911dbfd3f/pedot.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/8420239351.pdfIn PDF document text
    • http://rcot.by/pics/files/8251601997.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/pajitiba.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/xarozoge.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/nisiferozavofemiligug.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613149b55b630---51792952163.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/toseda.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/67851077514.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/992151810613d9f9f2dba7.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140478b676bd---mewulujepasogu.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/20566343655.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/202191372808051.pdfIn PDF document text
    • http://regmac.net/userfiles/files/238363586.pdfIn PDF document text
    • https://riwg.in/userfiles/file/tavotoduto.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/29728406967.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/9187703005.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/13119789004.pdfIn PDF document text
    • http://podarox.ru/public/files/36914720962.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16313896721206647738.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/98117705631.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jinoloritaw.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/jiduxujinapapi.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/negemadomobalibogexitanod.pdfIn PDF document text
    • http://artdental.hu/editor_up/gukegamomumobuwamivedamu.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_off0000e55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55A 18472 bytes
SHA-256: fc49075106e60d98454afad88fa3b9a1b5d291f83da70e5d0f9c99d0766a3142
font_01_sfnt_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 11032 bytes
SHA-256: 110cc05a7aab8f9fbe4151cdbfa86092f4bbe03d46e94d1fb5d7876897915257
font_02_sfnt_off00012e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1