Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbbf17d2f384d48…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 20:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7b9245cf11c6bdba60c29f2f75a0fe9e SHA-1: 27d2c6c93e3560f39997f571f9f1afb2c63181d9 SHA-256: 8fbbf17d2f384d48597d5faca3bf63cbcb638eda73da2e38c8ddf3275be27501
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or scam purposes. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=how+to+draw+link PDF link annotation
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/dakumalibetobegeda.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2167612e8b653abb42d189f0f8f08a30/57566763990.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/30104429130.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/19507115916.pdfIn PDF document text
    • http://santabruna.cl/upload/file/jolukamepev.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/5816041018.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613af2e6465c5---vitomoxefupawobesulajef.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/tesufimebise.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/raxaxor.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/3521971644.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210904165215251643bg6pzcvj1454.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/32d954ef9293f0864affa0bc75cb6b74/zosiwuvipezemum.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/89672678245.pdfIn PDF document text
    • https://spacio.hk/attachment/file/25864340697.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/pebaninamanexege.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/libijatibisotejonuva.pdfIn PDF document text
    • http://flirdining.com/uploads/files/83434509446.pdfIn PDF document text
    • https://fishuntpesca.it/file/najilurasepisajabitabila.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/18728151131.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/55902686370.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/lisivoroxabatanutasoruni.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/31928809023.pdfIn PDF document text
    • 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_off0000adad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADAD 16520 bytes
SHA-256: 135adb5075938654a626cd9bee6af90b53fcd5f109064a918702f914e8ca8df9
font_01_sfnt_off0000d76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 10108 bytes
SHA-256: 394bf8c61e9be83473d92fe9d9de3984b5f73021f5b888a046312efc2c6284d9