Malicious PDF — malware analysis report

Static analysis result for SHA-256 865d77dfdab9ba81…

MALICIOUS

PDF

83.0 KB Created: 2021-09-11 14:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a25b0ed3346a9d6beb2526102d4f977 SHA-1: 02f71289b5fec258ede1ebe700e05f9a3c70b58e SHA-256: 865d77dfdab9ba81282f7a46374297e4fbb7f5761e5d83cc264deeb6cff96674
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggests malicious intent. The file's structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=video+call+on+telegram PDF link annotation
    • http://cabanagarden.hu/editor_up/4166730892.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/34599931737.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109101959373323.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/80028002440.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/m8tuk2a6mqvqda7p1me1c7e8bc/tovobinemofotozekeb.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/gakumegejulufesefu.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/29123783780.pdfIn PDF document text
    • https://iohrp.org/f_files/files/63339682689.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4cf97614ac074c6c50c0b57786942957/dizipepipajerupiwe.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/m9n0ag0hjfhlelv2deqakn8v6b/pizekelima.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/gifutujuzemududumas.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/93833036494.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/27655180324.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/53652207148.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109081509132415.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/mupiwinofulanugikad.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/20830305519.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/29765885653.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/12746141539.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/rasokuna.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/26567418165.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/gulasoliw.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/tixofineleparosiwu.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/mimageluwujefekidi.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/16072244176.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_off0000e0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 10512 bytes
SHA-256: aee37e5c36be5516cf9e91dfea05c6fac5a2deb1cd08f3e72544e4256d2198f5
font_02_sfnt_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 17788 bytes
SHA-256: 5b54151034d1c8545f7416aed8c73cfdfe682040181e20ab92b7a29160d0d2e3