Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09e90dfc1159ca4…

MALICIOUS

PDF

76.7 KB Created: 2021-09-06 17:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b781d595535da1fd7c1377b8208f99d1 SHA-1: 1ab308aef2614cf3fb316779025792ff858282b3 SHA-256: c09e90dfc1159ca4fc3adbd430c896c259a0f49fd4aec3097fd49a46f8ce9846
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://kartywspomnien.pl/uploads/assets/file/vemaju.pdf In PDF document text
    • https://africanresearchcenter.com/userfiles/file/fulegage.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/wirurinisu.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210622_ccb5a.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc09e22f832---37706470407.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/xiwunivowawam.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b04c429aa---mofufegikes.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/suziweruxekakotirup.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/3201fe25945d3976f0a00a84d33a7035/porisalil.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/k2etobr97eljcce62ofplr56ll/vokitozusiwe.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/savelegalorofexukebijiben.pdfIn PDF document text
    • http://planetamama.ru/files/file/vawuwo.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/34325101322.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c84a344fd---mirefuxoveki.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/84rmkcnre9s3l2qpvmsl3h7iuj/wulefibowoxosupotu.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/15823645078.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/36891910900.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610a1d150c210---vakakekiromanefebele.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/nawabuwimojupesufude.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/62250578029.pdfIn PDF document text
    • http://findacommodity.com/upload/file/reguzufax.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/sonanekiwidejobit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=past+simple+regular+and+irregular+verbs+worksheetsPDF link annotation
    • 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_off0000c661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC661 17520 bytes
SHA-256: 09c4c2952451c1f6b3d44c3c0b397695a83f09cc95cb4be17ad7fd9e0b32a9b3
font_01_sfnt_off0000f32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B43 11324 bytes
SHA-256: 82d8c920d59d0140faf3387692e72415d388fbe27ea28531429caaa6ca31063a

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