Malicious PDF — malware analysis report

Static analysis result for SHA-256 011727750bc227c4…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 09:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd7eb79b9d3cb8f0d2a42546c5b05396 SHA-1: c2a7d4b2e16ff8ad31aa71f380e0ebb6eaf31e50 SHA-256: 011727750bc227c4707698e45396dd89e8e1948ab73501d82c53839b26d5a68c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c518475988---69349940298.pdf In PDF document text
    • https://yunglin.com/uploadpic/files/famafalenemenusereduv.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/17562733043.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/tafolotalut.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/bigokosasuzenabubuwudeva.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/nererikelenu.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/40500500788.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/fofeporobax.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342a638e654---vavon.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/658744865b12bed33c8d5759c3809fb7/30434354950.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/73186474233.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/3134392556.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/sirom.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/dofujozoxesobupuk.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/16337113908.pdfIn PDF document text
    • http://taigesw.com/upload/files/19867958512.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3fa957ece---kilukuro.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d507659e6e---28104834776.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/74828711d25489ab86a631f3c9f01f30/wuxemexoged.pdfIn PDF document text
    • http://mariancozma.com/_user/file/nimosikuw.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/22651780850.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/mopeliroru.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/68101453485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+similar+about+prokaryotic+cells+and+eukaryotic+cellsPDF 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_off0000d586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 11216 bytes
SHA-256: 757fb6eae02fb582ebf081a69f541615a67ad0bcd421ee119c8f40981992efe9
font_02_sfnt_off0001077d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077D 17968 bytes
SHA-256: bcbcc282fc7f212fa234829d060499a9383ed6c9033b80d951652eb39bfad3f6

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