Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2b23e64881d5c8…

MALICIOUS

PDF

73.0 KB Created: 2021-10-01 03:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a1a9195161697848213f7bc3070dd5d8 SHA-1: 569256c4c5cdab6093b4589cb53031756b4b48ca SHA-256: 5b2b23e64881d5c8e74ac88f70fd04d5b032fb2a52bae78bc5107126438ad96a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to malicious content or further stages of an attack. The presence of external URI links and compromised CMS upload links strongly suggests an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://amthanhanhsangchinhhang.vn/upload/files/16334104286.pdf In PDF document text
    • http://linpus.com/app/webroot/userfiles/files/lurav.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/76152431173.pdfIn PDF document text
    • http://workontext.ru/media/file/latejo.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/mirirebim.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/regabanajukoxanapufixiwor.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2fc04e2ca---vedosesenazerulewe.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/33849224372.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/xupulofipuselazumeme.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/78274514766.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/xirotulekonev.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/54440696814.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/31844367702.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///vopozukupebibotu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614546b877b23---22941073333.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312a18dad2c---gupub.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/63546991935.pdfIn PDF document text
    • http://elskenecologie.nl/files/20995029577.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16152cb8563557---ronunimonupifoxaso.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/natixefesonesolezel.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/mazix.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/gajurabixanopugezek.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/67725326346.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/mapekepirex.pdfIn PDF document text
    • http://khocabien.com/uploads/files/dizefazubolimigeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=boku+no+hero+season+5+episode+11PDF 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_off0000b720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB720 10776 bytes
SHA-256: dc375e691b047f3cfa65041bc95103aba32eef4a01cf83c8d9e16430f8214f76
font_01_sfnt_off0000cff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80B 17928 bytes
SHA-256: 70c541643a2fa813657da3ab301c2cf6314248b141d9aff95415cadf01478dbd

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