Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d21c871d1f38ed…

MALICIOUS

PDF

87.2 KB Created: 2021-09-13 04:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 55881bf31e4eb4c990524ad4a98998c1 SHA-1: b2441d55334ec4c4bbfc90f81b6a89d1c3548428 SHA-256: c4d21c871d1f38ed02b6786fc130afa39f1cdaa88ad28c7693db43719c2dd17c
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 contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

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://synerhu.ru/uplcv?utm_term=your+beautiful+in+spanish PDF link annotation
    • https://magicdiscoradio.com/userfiles/file/xeriduka.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/tiwawe.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/80143262565.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/ponakamufodanenapoj.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b770f94c34---20548913229.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/3462605707.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/fosapowu.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613566b034795---13091342933.pdfIn PDF document text
    • http://toroisg.com/public/images/files/dadisamolaremo.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba8641ea5---45745331106.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/puruxoxevijiwixowivu.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613096288c1c5---benuloperodaju.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/5373159415.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/53668212808.pdfIn PDF document text
    • https://hsse.cl/files/96052298746.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/23254542950.pdfIn PDF document text
    • http://oodow.cn/upload/file/210904191109286999cvfws8urd23w.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/35201446621.pdfIn PDF document text
    • http://maulich.vn/attachment/files/24439318587.pdfIn PDF document text
    • https://majubesar.net/contents/files/zezaxelega.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/27108352169.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/81994138017.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/77935446928.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/50625639861.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab5aa42ad---nejilago.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_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 20300 bytes
SHA-256: 727350859e93939f22d6599edc5089ad32bcb3309549be1cddfabc6d6e7fcf9c
font_01_sfnt_off00011ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F7 10676 bytes
SHA-256: aa757d7474fec4879c15e5f766cf187e1fbb842b7c279cdf3b02e095990e437a

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