Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d38582e8e9c0c3…

MALICIOUS

PDF

93.9 KB Created: 2021-08-11 13:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d94a4b435076b4103212121f9f7e1b5c SHA-1: 3a8263e8ead46b79f1c94285207155d57d4d20da SHA-256: 06d38582e8e9c0c3b0e76e94abfd38b7de8fa4afe5e30affd43e532df97d7074
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites, many of which are hosted on WordPress installations using vulnerable plugins like 'formcraft' and 'super-forms'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the embedded URLs and heuristic firings suggest a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=how+to+prepare+for+a+supervisor+interview PDF link annotation
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608850489dacd---vuzedujiwi.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/atfkvj1s42slu0qtutri8se0o1/dojagunipowegubedoxe.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61330ad1e5---dufijewiteberifelo.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/bb328e2c560a88a07b181a03aa7f93f7/93900258081.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/suzegebilobariwowimewu.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/tiwunas.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/481b852b84d8c8408385e03ce0864978/83103436502.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2035ea9efe---pexugorurojidu.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/patolor.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608375f7c7114---kilirekirojevorovexonobi.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609131fbc64de---81590317685.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/52900153076.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/c01a9ffa08ac7dab3e730ec3be5465c7/munutezi.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a018bd36e26---rutav.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/89546590603.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/98589100105.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/7d2ff7df087a0057aec83e3bbe3f825d/juwiwab.pdfIn PDF document text
    • http://vivalepurrexotics.com/clients/2/2f/2f65fe2011b8f0b07f64c29a74835a02/File/30294568279.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/xetudileze.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/84aca078d5778b03f62c4f33d92c62a6/36768214450.pdfIn PDF document text
    • https://wildnaturetravel.com/File/zamopifedisivuluj.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/42665828116.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc7bf440d1---turaso.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_off00010d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001257b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257B 16788 bytes
SHA-256: db113865b885c7b46d821963b342b69e43429ec96769e173965fefcfbd19edfc
font_02_sfnt_off000150ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150CE 10548 bytes
SHA-256: 814b64cde8ae2b989e972aa6c11fd4c8017366aafc2bdcc804679aa748c31120

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