Malicious PDF — malware analysis report

Static analysis result for SHA-256 fee23ee575e75962…

MALICIOUS

PDF

91.7 KB Created: 2021-07-21 20:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7f56279db72338c12c6c41aea9d9c82 SHA-1: 998a450ecec6eccef7ca09a398b080cb127f19b5 SHA-256: fee23ee575e75962697638dc503827e734c405f525f29ec1be4e5007e92599ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting an attempt to lure users to malicious content. The PDF structure and the presence of multiple external links strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mamo-tato.ro/userfiles/file/vijovinak.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/4163160fd049bff317dcdc1ca7f5397a/pegikerogaludo.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6c71e389eb7d0aca77e42571feb8c691/80957026006.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8454ca3e---gusalurel.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1023042fe1---53695932545.pdf
    • http://zuche0551.com/upload/file/91551471417.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094dbe785658---30772609141.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a014ecab3---nugizixagubisuxozoj.pdf
    • http://myjobcareer.net/userfiles/file/2021070815562973499.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/87c7c02042febe736f91404fcd232b14/93842083219.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/2d1588bd768b113f6974fee91d5d8ceb/wakatofujet.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868bb9319c6---17096535878.pdf
    • http://homeopathyhongkong.org/files/18454118539.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ade05aadba7---84773030619.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/ri3u8uccdth9l9grf2u74ga4l1/fifib.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/shds98ltcb7jkgiosdsoi4hbh0/54353910166.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/kjvfk0v2sb96dq0i6msfdllie5/nudidujopifapesidiga.pdf
    • http://gleneaglehoa.org/images/file/30513573800.pdf
    • https://thepainter.asia/upload/files/28674427836.pdf
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/97818155031.pdf
    • https://reparationmobile.net/userfiles/file/40639222586.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/274524573f3c6b78175bd0ad0e50187f/3294448763.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=exposure+and+response+prevention+therapy+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010055.bin
e56c3a636e88381267e33cc3ce7bc42fa84b326a4382b64e1c61a90d34207c60
pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 17924 bytes
font_01_sfnt_off00012ece.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECE 16792 bytes
font_02_sfnt_off000146e5.bin
a1a9562c883c3826aaca9463966c2ae2f6b0fa56da7fa3078d833b9a7b8938a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x146E5 10912 bytes