Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d87ccf40756354…

MALICIOUS

PDF

90.7 KB Created: 2021-09-02 19:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3bc31f7e9c16c82523be30402c8ad613 SHA-1: d4137eb2eefba93c31c176a7d25d6597b7a74204 SHA-256: f9d87ccf407563548fc256348b4491e7f85119fa76d954b8853333d9da631b15
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/8gvk056mnle7crq44e8ukt1296/bexevumorapelati.pdf In PDF document text
    • http://tinhdauvietnam.vn/upload/files/26130908191.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2a474735200c9683f6554eecab9f596a/6800415895.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/xafizesoledejarubiluke.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f2081b36194---lekurizaxarofuvizute.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/17412560588.pdfIn PDF document text
    • https://termocasasrl.com/file/mixudixediwozetajoravokam.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b72eda1ca3---melufemefajasekepup.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/80135331878.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/71868339565.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/32673852243.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608c885637efb---walumewa.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afdfb401591---99886100025.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/51167846718.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/gasaduxetuna.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/wakuzowolevo.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36115369073.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/xutakokijazox.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/51100932318.pdfIn PDF document text
    • https://faprosid.com/file/jawawagitujufegelex.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/jevozerozipepupi.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/45090411360.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16125695ecc123---gibejojajozogolapilizegoj.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877a3469cd7---11168794138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=mucositis+oral+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_off0000fd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001153f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153F 18432 bytes
SHA-256: db11ab512999cd75267aaea22a171a48d3c8354806053e99bf9936743d6874ab
font_02_sfnt_off00014562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14562 10468 bytes
SHA-256: 6a25e1ebf713a0d4a52b0cba7d948eeffea7f29e0d808b01167c2e0bacb8bdd5

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