Malicious PDF — malware analysis report

Static analysis result for SHA-256 d970a99b66e958c4…

MALICIOUS

PDF

85.5 KB Created: 2021-09-03 17:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 187beb9bd37841d2274d5e2d7fc09f94 SHA-1: 965518f867074f429436b9410ec89fefcc09c614 SHA-256: d970a99b66e958c4177bb4119c0cf25c19113276d472616d00bdbccb05a491a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to phishing pages or download further malware. The PDF structure itself does not contain readable content, but the embedded URLs are the primary indicators of its malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=avital+ronell+books+pdf PDF link annotation
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f22ece292---vobojelivovosusomip.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/30fe03da283430efbf06c9cafa2251cf/642257247.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/72741620979.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/96356768026.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b5e403ace---vilofezuvujarefus.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd5ca1f245---nogidonapa.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/11687314566.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/88ff425015d0e16f11b8316f01400404/larilolulonoredamubutilew.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/r2t7sqfap76s59mdh1k6nlof20/vileloso.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/59582687632.pdfIn PDF document text
    • http://headrepublic.pl/images/files/24959415548.pdfIn PDF document text
    • https://unosms.us/userfiles/file/24732719258.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1780d14c79---92059657639.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/4013628527.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/bafageruxeres.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/fexufod.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/puxodazokasobibuk.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/68be8a3618bcf2a18bcac5e4792990e9/pokukajoxopitemexowiruf.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/43f69b40e93a4fd2caff27304091e600/xulawofotu.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/titaxuvekabisejefafas.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738a85a6442---jisafunaxire.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/64d98dc9fb3cb9ea0332db9f82313d75/joxosofirupumapozedazukod.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/16788442791.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/461f102bc495bb1c1ddd04017e0a780c/besewaguwigegati.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_off0000e728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE728 10772 bytes
SHA-256: e099a1aa3f559736b0857e75889a45d57011542b015102b2531a1882c788b479
font_01_sfnt_off0000ffdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDF 18644 bytes
SHA-256: e10679a7156a39cc22712588ea0145c9f67f0e6d5a35c0fe7c9206f03c289e2e
font_02_sfnt_off0001300c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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