Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc470a04a5c8a91…

MALICIOUS

PDF

69.3 KB Created: 2021-09-29 13:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: defd7785369201b0d308d1ed159d521c SHA-1: dbe3bffca59d6e0d0494a80b0dff7b4e56f7fddc SHA-256: 3bc470a04a5c8a9118da734003340d229e9cb13eed99d13530a01615236bc1f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI heuristics further supports the attack pattern of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=locked+out+of+android+phone PDF link annotation
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/tupotatamefudof.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f28aae5bb---24943345010.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/44955784633.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/82254834139.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/vezemirewoliloredifalagid.pdfIn PDF document text
    • http://aedjtj.pretty-match.com/upload/files/tikonewuvivunokokof.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/bosamixavimagesewulalup.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/061402449684.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/13887065956.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/4cbf821ee47003f6ee99619fa52c3708/befajaliwin.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210921022843.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/36492933155.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/37397926513.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/33824010984.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161354ae529a16---8980360765.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/67086968933.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/54995276053.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/42311169467.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614408231a17b---vunumemumex.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/16741017182.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/3589902060.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/47708344771.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/xunomezavisamujoxivaleno.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_off0000b233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB233 14728 bytes
SHA-256: a7ba940d39443b51ec9eceba20c3c2377fd36f74bcbfe6c7636c0b8901c6d1e6
font_01_sfnt_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 10652 bytes
SHA-256: 5fc0bd9e80c92f4520b4cd200a6888f0131edc18646e1ee930a1318ca0a94393