Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ce79a76b9ffe47…

MALICIOUS

PDF

86.4 KB Created: 2021-08-01 02:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3c6b484f42f175a20dc1413789039f0c SHA-1: 777f8c17ff181003579756bb44f71ee8c90bcff7 SHA-256: 66ce79a76b9ffe47f1608666db4214d8849e1855832ba5802953e2aff3677ed0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, likely intended to trick users into downloading further malicious content. While no scripts were explicitly extracted, the nature of the link farm and the PDF format suggests potential for embedded JavaScript to facilitate the download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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 http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/dilutisitobunobivolab.pdf In PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/tivaluputeralepapemoz.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/21012526926.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e38bf27b93---zufak.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/9tdil2pkvheit8gq1betqe6bgf/58449240163.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/91005475256.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/19fo70ocho5aba0u3q7b1thdg2/gojipiwakutivetosodig.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a1c26c5d4---nozofavesubagojitupoxovad.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/42440593886.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/90180813344.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7m0ctjgod6k4kr166fh4k3h6d5/xuporaso.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/64270278463.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/43945330810.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/98971908102.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/89632010839.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100f88736ae3---89311880199.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/pve3ghfknvmuri0l9phk6borp4/56014140182.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a7b9d4039---botofowomixez.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/13508344250.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/i7k2dvnphr1m8t9f4glj2g7gca/36087647472.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/629060af28c4d06174c15d2eb0d215e5/nadanupuzixasab.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/2499264042.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/nevatopawazupojamelafe.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/bfa4dc6fc96672de946f82a40c8eee9e/36485137497.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b99bb8de7---kigaratuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=kalabhairava+ashtakam+pdf+in+sanskritPDF link annotation
    • 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_off0000ed8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 10800 bytes
SHA-256: 8490e7a25b3a332bc6b268850357d25d4e00e78c51df5a5d5f060e469e7a7fc3
font_01_sfnt_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 17420 bytes
SHA-256: 770c4e89177758f0adf2945a6520efaf5e2ffa11427d407bbdf20a08d6bdeaf1
font_02_sfnt_off000132f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1