Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aec323f960cab36…

MALICIOUS

PDF

80.6 KB Created: 2021-10-08 04:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fcb9dcff68745c864bc1e04970664d87 SHA-1: 7434ca31a09ee3b188d13abf4f498a1bfe5076ad SHA-256: 2aec323f960cab368ce90cf135deccab2fd2887d8efbb7a71e507611fdec295b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://crewmak.ru/uplcv?utm_term=how+many+relentless+rats+edh PDF link annotation
    • https://funbugs.ie/userfiles/file/29840646762.pdfIn PDF document text
    • https://costarica4d.com/contents/files/wexonedopolix.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/45888220010.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/gesujozibobivagixoritara.pdfIn PDF document text
    • http://esistore.de/userfiles/file/zitamumaxixediluvene.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/tutirelevijirobunozawelo.pdfIn PDF document text
    • http://langmypham.com/luutru/files/wufumiwakuriw.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/gimufevimegamegamab.pdfIn PDF document text
    • http://precisao.net/files/files/pudajasijam.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e94f4fbff---32898165860.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/aklt1mb7kdfuujk691jns9sun7/vegov.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/22393712297.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/rolakijorovagam.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/71223714413.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/44614484804.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/e05175a9ca7b36b185e1eb21dfadafcf/sominipolofafikadumode.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/17792875857.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/42567529860.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/vewitozabaguxogiwunita.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/kexugurosigefeforo.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/9717644905.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/45228948463.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/873210856.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/blhm6rav3aaj4t1297k7ca7j11/wanaredokinuligewinok.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/mojizumofeverulogosipesez.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ffcd903995---mewonelabiru.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/repazelekujubebafuso.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_off0000d1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D0 18864 bytes
SHA-256: bfebdf5d5423bf0378e2b9357553ab486ea88c33daae3d697069b55d255d7b7b
font_02_sfnt_off00011b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7B 10612 bytes
SHA-256: be1d3019996982628d9900899b8b6993708d50660a5f2cfb9507316cee76874f