Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c17d144525d0db…

MALICIOUS

PDF

78.3 KB Created: 2021-09-03 09:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a12e2274d212edeeb60ced2d11f27f1 SHA-1: 5d7d5108a2faa8f6c27b46d5abc270e1b43bec8c SHA-256: c5c17d144525d0dbbd1f2416add95f1d01ec43a92d456430a1888f7f5c50a4d4
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://camelcarpet.org/d/files/15255629329.pdf In PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/goxasugafarupujajutuf.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/17564704393.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/26126679043.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/85627774473.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/dajejid.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/nitejifavadizemizonikiri.pdfIn PDF document text
    • http://praguetransfer.com/files/file/97084416515.pdfIn PDF document text
    • http://lawngo.net/fckfiles/japigeripinidevasajofubo.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/76371641947.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/9fe475cf30ef1d9886659325bb480e70/65857953657.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/4693530f4fb967fa89751c5e6b3b53f7/89719651281.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/97945642748.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pozixokusamipug.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/79679412645.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/81891938850.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/xarikowoseja.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0077236001630372091.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/xozumaxutivodibufonanazav.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096f03c48134---53941735155.pdfIn PDF document text
    • http://southwest62.com/clients/6/66/666176aa584decdbf8d0f1e9213c5ee1/File/maxepiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=livro+cuidados+intensivos+de+enfermagem+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_off0000c6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0E 11040 bytes
SHA-256: 1c8686aa89dbd67e09ea9796f061d965bd10b64bf9ba92c5ad52eea33a7b0ba5
font_02_sfnt_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 20360 bytes
SHA-256: cdbcf6fbbec414cc8060e5decb932733cad3bf4277b132a2b298dd63a6453e52