Malicious PDF — malware analysis report

Static analysis result for SHA-256 26deca9f904f9f17…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 01:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 84b34ef623e13b2368b022f472bed014 SHA-1: 30f9f7cdd2c72ae8a5fc96d43cee139bf418b7e8 SHA-256: 26deca9f904f9f1732bf7fa2cc8e855f239651348f788c64575b899a6732537e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kdbelektrotechniek.nl/uploads/file/bedudokuzijepujukabibi.pdf In PDF document text
    • http://precisao.org/files/files/tolinugofasubenanasavo.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/95479139339.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/63514228023.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/58302620352.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/78592794855.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/28291346926.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/6205271741.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/benapatikanowuwekafinoj.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/pusowufewetofog.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/fotuwaneke.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/metubujenenarikid.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c1df8c4feaa2d0d5045270f204ab2da2/95199710678.pdfIn PDF document text
    • https://coevent.ru/upload/files/82206893973.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/96845123500.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/21109426738.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/kesarotijidalitevini.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613469656c4d1---jekipivenisosatela.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/77960179786.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/8842655428.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/kozelojidifiv.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3387457f0c3861af7c0b0364e4f91aa3/romodege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=watch+the+good+fight+online+freePDF 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_off0000ccb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CB 10580 bytes
SHA-256: d9c98504ef126316b99a78c381ce9e70529b957769e7abcc2e752a3a1854bccc
font_02_sfnt_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 22796 bytes
SHA-256: 830e70af8775615a4bffa6cd672c3cc357e2b66027b261a057219c0172116db8