Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d94b186e04f779…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 05:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c94d9bf6152f3d59b1c6609c69f10906 SHA-1: c4aa2eff99089c7e8cf345ae91968d959039d7f7 SHA-256: e4d94b186e04f7793300ff618180a1bd1150eb5eaa5e1c53bccaaa73b547446b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains. This pattern is commonly used for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://sukienmiennam.com/userupload/files/70292640591.pdf In PDF document text
    • http://pantryscan.com/123cars/imagefck/file/fipage.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/ec32f5ce359d5c5a2ae5ce4edd7e89f7/16629739568.pdfIn PDF document text
    • http://beateromer.com/bilder/file/534011921.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd90acfe5---13980377191.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/63317712357.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/18592951713.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/10376708904.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/pemewisaluzifoduzifu.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/555e068bb2723e267e6473fe1aae907e/xukumatikirarototanem.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/71164848500.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/43918927196.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d766acd7f---maxuvebiwipedudepatejib.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/64349103937.pdfIn PDF document text
    • https://estoniapools.com/contents//files/tojoseboweron.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/tekol.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/77228181523.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/nisozuxowufuganu.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/87463388768.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/minijijixekuxuf.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821525b0560---kuxorirofivuretovenos.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/46390338510.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/sigaxumonuvepisal.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/hprtmt22lansj1aut0j0qoupbr/16635855018.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610095862c076---65578547083.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/xafufupinet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=lcr+meter+working+principle+pdfPDF 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_off0000d2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CF 10768 bytes
SHA-256: 39d4dc6870c1fdac69c31eb9519c08a6e689772cf8226e9daca4af388f41f76b
font_01_sfnt_off0000eb5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 17184 bytes
SHA-256: c541ec4520a1c29856cb4d69ae96f8bb986ea37067b1fc6be311ff5471444dfa
font_02_sfnt_off0001170c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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