Malicious PDF — malware analysis report

Static analysis result for SHA-256 b102b358f9a9cfc5…

MALICIOUS

PDF

86.5 KB Created: 2021-08-05 16:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e3f018ee6d6b1c1b5759885076de682e SHA-1: e9d58c8f75939d3a2a21843cb676f39ce1482130 SHA-256: b102b358f9a9cfc5f778c5875e9d0b18195a8a4cacd5684a86ac1542667d0426
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to various PDF files hosted on compromised websites and disposable domains, disguised as a 'Chick-fil-A nutrition menu PDF'. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://cheesykeju.com/contents//files/22337215817.pdf In PDF document text
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/50082253666.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9858c5e8c63a0870ce42ab63318eae0a/zoxivebovawawife.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ea3791dd3df949eca9bd2db4c0ca4ffc/7393681347.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c654b006ef---kitibobigoramusizow.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/cds5lquod0mehts4956u4rqmgc/13237566073.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/54556755045.pdfIn PDF document text
    • http://geose.ru/userfiles/file/48090795370.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/ad66c396afa0f4a44cef90da62b4f667/80063260932.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/8aeb531c50f2654e9a8f35de1ebbab59/siziragojesi.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2807b8b0e---muxafimafurowoxubureloku.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/57491067473.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/15639380940.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/zifojivune.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608082ef4755c---kerukiledobefulesu.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19511804497.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b46b0841bb8---funobolo.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/fusexunivipe.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/4521065002.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/91050196444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chick+fil+a+nutrition+menu+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_off0000ee0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 17504 bytes
SHA-256: f3ef51b79ef991f124e179863c1c8092194f58cf2a7529ecb47193d5c344d2a2
font_01_sfnt_off00011ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA1 10940 bytes
SHA-256: cce6bca95528eb29ff46dcd4d0a63f42da20938ddbbb435f906f566517db18e0
font_02_sfnt_off000134d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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