Malicious PDF — malware analysis report

Static analysis result for SHA-256 11023c6300da71f4…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 01:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 31ff76211d2dc277405240d6e7121312 SHA-1: f4dff311f62e3711d2280936d79fac81380a0f8a SHA-256: 11023c6300da71f4d83bb62da81e1a39e15dc2b404d6e9060325cfa50369a30f
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pixomot.ru/uplcv?utm_term=little+big+city+2+unlimited+diamonds PDF link annotation
    • https://floridagreatescape.com/media/file/37284986086.pdfIn PDF document text
    • https://recrut.com/files/files/vimupuritojubov.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356eaa8cce9---49053230762.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/44290066175.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210908161747.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147bf3c96df8---90158504798.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/7sbfmbhtoep5mr0masl45482c5/nogemaj.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3486bb7fa---gezuzuwokekedelasuginu.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/25239877541.pdfPDF link annotation
    • http://to-tuong.com/media/ckfinder/files/45555459865.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/vutonimimi.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/renojidaf.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c190ec5553c4c2d37bacf4a186059082/sujomekedamo.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614318b5552bd---damopesefojakoxugetupan.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/xupikojologikixuri.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/gabosibozikapijawema.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/giwoguvi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614163daaf5f9.pdfIn PDF document text
    • http://hueide.com/upload/files/nelabewuwamibisugezasu.pdfIn PDF document text
    • http://faradbox.pl/files/file/jejisiteziveloko.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/gewozelupiruzerosa.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/xanorefakebesedid.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_off0000af9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9D 15908 bytes
SHA-256: 41a0e5922b1a7856bb79d9999430d3981ec7a4bf84885542f33354d455930930
font_01_sfnt_off0000d850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 11044 bytes
SHA-256: f61ba0548f860d1de8aa72d12a8a7b735b6ec925943c065c14f8b7d4f156b6dd

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