Malicious PDF — malware analysis report

Static analysis result for SHA-256 c144dcaf2791052c…

MALICIOUS

PDF

90.9 KB Created: 2021-07-06 01:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e1f4d82892b15ed1e4a083ed6d1238c3 SHA-1: 0f4a3b01dd26feadf105281b5166127c3c360a0a SHA-256: c144dcaf2791052cec0ea1dab1b8c60594e858e87438f715955bc5f294273aa5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content or phish users. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/0a95f954b35a7bf5694b0804a0e673a5/71550545087.pdf In PDF document text
    • https://gyandeepjkss.org/userfiles/file/11620529358.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/76938319414.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sofawif.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/4479767312.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/wafamifur.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/30963954987.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cab5b52e3---24684981408.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/56138991172.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084f7c187b2b---10107760630.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/kdknvlq78skcfu9tk7ftq8slsl/bevod.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/gazasiwiguzajazozesonu.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/1sf9hjjrio8cm7qvg42r8f9p02/nesujodadijigifibilus.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160a42b57dc4b1---47924718306.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d7e10419.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/2430853017.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/n6t8ecsiqme1j5qdmq83oblhdd/fegapopeliralez.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ff8657f0865eea3be3224657c4f9b679/kakuv.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/25466657888.pdfIn PDF document text
    • https://magerp.org/upload/files/7422153603.pdfIn PDF document text
    • https://schmitz.cz/res/file/magumizamaroke.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/bisil.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3vs8c3f4b95kp4kkd1vn3gqj48/fegigekoz.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/gefevazeliwojuxujonoba.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/gefajovo.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/10434354289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=animals+that+have+gone+into+extinctionPDF 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_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 10724 bytes
SHA-256: 4d3dfa5ccd470df551005f2fa55292eab943eddb6b07ec2b3f3e6a50850ff02a
font_01_sfnt_off00011a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A99 16720 bytes
SHA-256: dbca84ae0f1a30b604169904067795c3a7eff9ba437cb7a8a63f3bbd01ac0639
font_02_sfnt_off000145f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1