Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdabafd1be483dd4…

MALICIOUS

PDF

68.2 KB Created: 2021-09-27 04:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b37933d040d5eea11b1a761ada2fb25 SHA-1: 8736b8fb8ec150d38535cf74bea114ae9ad8751f SHA-256: fdabafd1be483dd45a857911bd112195c10073a36cbcc065c7b5e253fb8da77f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised websites and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=unity+android+il2cpp PDF link annotation
    • https://duproject.com/uploadEditor/files/tutikilemetuzotuzo.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/18403969225.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/75165593878.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/9941eb4b48f0f6092bde41348b46ff89/84856374202.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/dejazuranapafe.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/89505190684.pdfIn PDF document text
    • http://border-collie.ru/sites/default/files/file/xizezumobiwefu.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/28372039191.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16143bfe8158d8---25235376906.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/11728276709.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/70958048225.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/55274258603.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/47225600495.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/bupikuzalukisamanavadana.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/797c51ebb6d7ca016db53d7292eea183/21778823584.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/40236296633.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/55882881262.pdfIn PDF document text
    • http://dongphat.net/upload/files/37455875467.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/fivinuvitu.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/20334464007.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/51208676515.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/03/45392542904.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/18794739049.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/notalulapipit.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_off0000ae9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9A 14728 bytes
SHA-256: c8ae015b166bfcc435899cf6d436108a297fe3d129f71931b8e3f8d49f35cc99
font_01_sfnt_off0000d3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 10448 bytes
SHA-256: 7c7083b688ae213802d092defc1a4d893327a37df7135ad8a15cfda51361d7c0