Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a6621ad35bec54…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 16:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98f531f8f21b49a908bff1f70e586ed6 SHA-1: bd36c8ab314d23d2241b250904334f5c83f03694 SHA-256: 69a6621ad35bec544ef6a1482ad1e1b09fa33f097aa4ddbf65e5170748c24b50
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the PDF's structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=best+cartoon+app+for+android+phone PDF link annotation
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7e204063---bigiwasamu.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/gomajoxenegaxifupog.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/93958161389.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c51305c7e3---mikos.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16146c98d2a3fd---butivajubakogubi.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/73085250075.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/30997612063.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/74947288672.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/rubokekojemiz.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/50279891957.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/0f3e065fdb16ea132a40a273498e1809/72696442157.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/77307188324.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/kuzoj.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/xasivumoratesopego.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/jasisomotosinemepunu.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/xevimefumimebifonejot.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/74683921065.pdfIn PDF document text
    • http://beijingteye.com/upload/files/kisude.pdfIn PDF document text
    • https://bczenekar.hu/files/file/bobewojininaboxaxov.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/dupumeki.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/24794298555.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/361c95b1c5ae64637adbf50d263389d3/bofitavixiwusori.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/44082187567.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/pawekosujewapok.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/acb159508b5ec1c9a74b9bf48c10e9a7/nuvibuwexefi.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/63310316134.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/qtjfbhe2u4an3a0q9u7vus0qs2/kufekabemuvifafilafig.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_off0000b310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB27 10724 bytes
SHA-256: 9ce9303fdc9f6e1c325aee6d38612d23e2abdaea8fceb4f73db301ff933295a4
font_02_sfnt_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 16516 bytes
SHA-256: c9111b607080b26e04a9dc4ff4ae728ee1a7e806d310804f8d5ec2d51183b8ad

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