Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af955bfa3b5febe…

MALICIOUS

PDF

82.4 KB Created: 2021-08-31 18:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4d0a90f28a868f6ddea5901c0b286771 SHA-1: 9e1afff7065c7f2edee7c59c4b9dc571bfe7ed9f SHA-256: 3af955bfa3b5febe1212832b67962442f133a8fa0446137fb1198b764e5078bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of a 'download' button lure reinforces the deceptive nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=how+to+move+pdf+to+books+on+iphone PDF link annotation
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/15f506f341838280453442d171816f20/28706567016.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/1257cc8006611f318a782d893f472edb/22322617162.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/mamejikosomizarikiv.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/f6376be34dd9d0236a2930b105255112/kemuxobi.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/bevuruwoxapisofatuvuxo.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/nosemokavetesikokokem.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/92924164493.pdfIn PDF document text
    • http://bakoca.hu/files/file/96023003693.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085f2ee9ad19---nolezesudife.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d9f025a3291dde6945e830b8d6d231d9/47462510311.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/1238342419.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce94eec190b94b33b194045861b8eb49/bowiselozezarabopojevup.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/97075521687.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/38551639008.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c111ae899c8---nuvesovaterij.pdfIn PDF document text
    • http://bastola.org/userfiles/file/nufisuwet.pdfIn PDF document text
    • https://schmitz.cz/res/file/mapereb.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/balopexexo.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/pametixoxoxetafumanad.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b131090dd8b---95348499825.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/311345145046.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_off0000dd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 10832 bytes
SHA-256: ca4536ec07a3234d218ca1117dc845c894d5656e9e4cd25d6d8779894345da2a
font_02_sfnt_off00010e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2E 17552 bytes
SHA-256: 7e26d57acd012d7779620b6a80936e66a7a2891f75a84312ffaf00a9ff02e941

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