Malicious PDF — malware analysis report

Static analysis result for SHA-256 6344aa05cf7ede22…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 19:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d5841b4691939bb6ce1949ebcdbb08b7 SHA-1: 52bb3d2cd332f2ba129d0764a2911c99057c6dc2 SHA-256: 6344aa05cf7ede22266dd2d9712697aa85f57d46adc15ec50054de9adffd4e21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=lspdfr+mod+na+ps4 PDF link annotation
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098499b8e56f---19018571407.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/85578414143.pdfIn PDF document text
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/kimowi.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609560e03e101---rubasojuvivomabugav.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609659f2785b7---63932790557.pdfIn PDF document text
    • http://tianfonmm.com/d/files/97928942576.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4830e6f0643f2c4646989d366f29e7b1/rojusijezumekirewatiz.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/lalarejadizawufikamo.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/karujajewonus.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/99838706345.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/82045c93d2e6b7a953ed8f0ca75f0050/10291617497.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/wesitebuk.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/2e1483c1fe9b47c75c67fb390e3a9f99/fumufalenonorepugorox.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/wonamiwawizatoxosilolimab.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/66971971623.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/beromaxew.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae48c12702---leposerewabi.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/40184852508.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/45796043557.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/jenizanijani.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/losojofegofovikupozanova.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081eb852f819---35526634549.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/zififaxonemoladuledamibe.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_off0000d91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91C 10324 bytes
SHA-256: 17323d5f7da2161e57f753e63175f482dc15354fb12b030a5708d8a2642fb763
font_01_sfnt_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 18740 bytes
SHA-256: 95c1db10f795ef645b2d2743dc76360529618afa88abc4ff2c38ee8f38081ca5
font_02_sfnt_off00012101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1