Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ca856d5ce39260…

MALICIOUS

PDF

73.0 KB Created: 2021-09-13 19:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de1e0745e3a1032d5394894b4cbf2c26 SHA-1: c02c46b398f37a51f80733d7ec5f3354595ddc2a SHA-256: 08ca856d5ce39260dada967ba479acd5dd9c67837c43f4cd382d3f68231830e6
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs that form a link farm, pointing to various domains, some of which are associated with compromised CMS uploads. The document body is heavily obfuscated, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely attempt to redirect users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=dance+moms+season+6+123movies PDF link annotation
    • http://nakajima-ya.com/upload/save_image/files/49686882774.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/turaxevuribe.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/gubuv.pdfIn PDF document text
    • https://menu2uplus.com/images/file/vugaloximubewelepavofel.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/tuzetifoguladozapef.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/46213271758.pdfIn PDF document text
    • https://alev.az/userfiles/file/dapajalazadabud.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/najewekebuxojam.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/43317298205.pdfIn PDF document text
    • https://buka.ru/sadm_files/rawunume.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/29536502290.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/60492571679.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/93944457872.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/59710574681.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/buretobavoniwijoworinob.pdfIn PDF document text
    • http://millecolori.it/images/file/nawomebig.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a5f395076---54433722318.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/guzolati.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/wevebaw.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c50385467---23954945368.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/xamutanosab.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f70bb2a2f7---26187892755.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109010725349890.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_off0000bbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EE 10728 bytes
SHA-256: 1ddf7a315b0d516f5cf4218245cf2b3b0c03fa4f35a0e7654bb3260cab8f8951
font_02_sfnt_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 16268 bytes
SHA-256: 941dbc11b47aef847acf74245b2e83a4299426f42de03c70d7420370cbf7fc72

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