Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19effb9c2fa9e66…

MALICIOUS

PDF

79.5 KB Created: 2021-08-28 19:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b95e74440ba17bb0155060be242d755d SHA-1: 1b5308f508b08c3a25aa25b10d63e2f88c4e9569 SHA-256: f19effb9c2fa9e660f53d9e31ce12a88bd523cfbe53a0d9f14c8d4d0139fbe98
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, presenting numerous URLs that likely lead to malicious content or further infection stages. The presence of compromised CMS upload links and disposable hosting suggests an effort to obscure the true origin of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://an-ocn.ru/ckfinder/userfiles/files/supileluwiv.pdf In PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/bedipebu.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/abdmaapjhi6e5au7ho2n4ud425/felusi.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/pumezip.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0421e40d56---11669616909.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/034tcs81blal0bdbh14al4k74r/gelima.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/padudufu.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105e998b13f9---36574231534.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb91bc0b14---63372568679.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/t5f9b8mejstdih82qjogmch221/jexowunafaxekafidane.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/78403188257.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/77336770185.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e6c80dcd690d4f4f9fc2a7db17421006/50710967948.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/a64f6bc4159f71a0f022efbf7b8e9381/46094078989.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076c8ebd1270---fobam.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/poxisafimut.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/73663a859274b139626201c8da0fef57/sesarutojemipurimijuku.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a0310f7b---90233854723.pdfIn PDF document text
    • http://familiesforfamilies.ca/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/wifunagozaxubakudawana.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/08/files/210807033058.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/gupuxitukawokek.pdfIn PDF document text
    • http://bdn10.cz/files/file/rorufozigidupitasaxoj.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160805ac91d981---jemuvemowowalewopemumozer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+add+text+on+word+picturePDF 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_off0000d3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CD 10572 bytes
SHA-256: cb14bd8a7d9137d43be25c3fa1653636dff5ee964a67426d7625bd74b6d50a68
font_01_sfnt_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 16876 bytes
SHA-256: e19dd625ec5056ec3fe6e87ba0ce4fc8a601dde2f1de7452a09d50fc0db31e84
font_02_sfnt_off0001179f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1