Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfc0c5dc0996e20…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 08:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3fcb6252d39cc8ebab6fc9b6fc26366 SHA-1: a4420554055c20c0423c66dca374be90764768d9 SHA-256: 7dfc0c5dc0996e2035fdfd138cb5ee156a684547100100ea08cccdaf731e131a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This pattern is commonly used for phishing or distributing further malware. No scripts were extracted from this sample, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://jingkangchem.com/upload/files/66563743960.pdf In PDF document text
    • https://finomisgurukul.com/public_html/userfiles/file/bupuvovorafijiv.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7938e19dd---78399102063.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/12170192045.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/79706184460.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tgll5aj658k6tf1m8ljoqfpcgo/85755268346.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098580d0d0d8---bajefalivakowogopigima.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/80748534889.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/56329653768.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee24d8ae2b---37465061012.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606edb83c41db---52699140997.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/54106703060.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210803_190314.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/43800122944.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/goravavatagobopodurugat.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab64b04dd---rogelax.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/jeriwibarixepawaxavo.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/pojobipaz.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/29735dc65eb0b03a8bc8e65fef7a6aaa/lumer.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/edf7d3d42fc8c4ea8b164b799bd318e5/jiliselijejirovojoveb.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/mekarupujogofimobojunale.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/941d6c1719e39c806ee2f1c43ea2f0d9/mabutagadavejimofe.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/91791375744.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/pudg6a63b8svp9lbmfd5e7r8d3/47863421324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=maths+worksheets+for+grade+8+igcsePDF 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_off0000e0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C4 10984 bytes
SHA-256: 407d2bd55588a25ce84aae2f6ea6ac95047038e414e27837a890679acd681e5c
font_01_sfnt_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 17612 bytes
SHA-256: 7eb6a7af3f5ecb49efbb8718bb66f8fa4486a0f3e30e54589fffd617f4bc7305
font_02_sfnt_off00012824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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