Malicious PDF — malware analysis report

Static analysis result for SHA-256 3528259cbf998d5d…

MALICIOUS

PDF

77.7 KB Created: 2021-10-03 03:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b14b2f7364f411b949120656b4cc6e66 SHA-1: c15f20de13df9c792d053f4cfc4ad50b9cca8760 SHA-256: 3528259cbf998d5db006267e7dcc89d536fd3f6d631003397aab22e0a46deb27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs and links to compromised CMS upload storage, suggesting a phishing or malware distribution lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=sack+meaning+in+english PDF link annotation
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/d0a3dca395bf482ed3c3d2dca42835c4/fofikemudesagonawivo.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/45664891147.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/6076116838.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/28f7061a0c80d86d43e7443a5e505631/69839202321.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/lemedifilurorowagalukunu.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/69845431117.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614505a41fc0c---wodepudupijabi.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/49774312517.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/45625779347.pdfIn PDF document text
    • http://www.agot.pl/upload/file/wokukamikuvejogeparid.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/wujapupaf.pdfIn PDF document text
    • https://uudanbury.life/files/file/rojidixa.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/392904709.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/fugagorut.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d960b7d58---sofumerovibadisebif.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/94289237097.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210909070601.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/54165170372.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/vuriposuwudumiserog.pdfIn PDF document text
    • http://chineseclothingonline.net/File/zulesujojigav.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/tafuvovowerajulojawiwid.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161408bae8a3fd---mapebibe.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/75578885819.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/tijovukujapome.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/kebenuzagigamepu.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_off0000c23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23D 21468 bytes
SHA-256: aec48a3ba8544d62f9b228e6f5aa1b6e93b8d758069eca2d351d147714da326b
font_01_sfnt_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001115c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115C 10528 bytes
SHA-256: 27395c27329e68af4c76eb2c88c8b4ede33e19f13b82e9be739be2b0869ed6fb

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