Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84788786e716573…

MALICIOUS

PDF

81.5 KB Created: 2021-08-28 23:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e8fa006cc376e44395e684dbea27aeab SHA-1: 5ea625be6566d2d14e7c9e17589a40678e39e9bb SHA-256: f84788786e716573716af7678068691f1e6fa85efa4665c715b36fc2b2aa2a3f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/368cc3c8caa8735936020d93cea78342/kenajad.pdf In PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/mimolulutubuseditefosat.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c773d5513e2---dozixilikejoguwapejezuvat.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfaf2740b9---fapazilozasegagulaw.pdfIn PDF document text
    • http://goref.ru/files/file/89132495146.pdfIn PDF document text
    • http://armanetti.com/images/1841726099.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073ed8cf2f72---65446776608.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/kabufe.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/31737764723.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5b3dea9fe---43874317197.pdfIn PDF document text
    • https://csodamalom.hu/files/files/wamodesu.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/6uqa1pflg3c1rivpvfkuona5b4/78878221828.pdfIn PDF document text
    • https://bem-sa.com/img/file/xoxafowizesoxexawalen.pdfIn PDF document text
    • https://werbemittelag.ch/upload/file/35817367557.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/71765291576.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/85084331012.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/3947d3dc14bd9101e48fdab8e92acef3/29175412414.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/junuxipujipuzomexupakize.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/92672066567.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/89120552812.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160766fdc99ef1---25722497212.pdfIn PDF document text
    • http://planetamama.ru/files/file/37137292059.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/6116693223.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/vuparezezag.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91b83ef65---vedalev.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1f1a46d9d99164c094d433c08946244d/kexuleba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=felony+aggravated+assault+with+a+deadly+weaponPDF 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_off0000d982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD982 11016 bytes
SHA-256: 86750d9e7973fd175d610114f74497601aaed3d2d369a68da00770d138842861
font_01_sfnt_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 17272 bytes
SHA-256: 77d421ce4f31c6b151e3519547767c728eb1e1d5d8df596fd6103933b226de49
font_02_sfnt_off00011ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1