Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee42c44167d59886…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 18:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7760ae1c91060d4790372e402f0f86ec SHA-1: 43e5317b7207a9ceb11c8af525f47ac4b7cbbb8a SHA-256: ee42c44167d59886db39a167a8769b49503b3c5f37dbb7046ddd3659032f7304
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to lure users to malicious content. The presence of multiple external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lacasedescaraibes.fr/file/nanobegalavakojifof.pdf In PDF document text
    • https://big-affaires.com/img/pics/files/90286633998.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210916110134.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/92102318450.pdfIn PDF document text
    • http://annabarons.lv/files/files/94118273739.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/64833839997.pdfIn PDF document text
    • http://th-hl.com///upload/files/venukemivemarefutimuwiw.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/kofigu.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/sowalosegozi.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16138c989e4e7b---wuwapomokudolejo.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/b6f1450bd83632fbf4f50d4158350bf6/78378450424.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/83571008771.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/doposiwum.pdfIn PDF document text
    • http://gugugroup.com/userfiles/15278138649.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/45968439765.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/63356085809.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/61571643702.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ocp896gebagc3qv4vsahpk08es/84172173582.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/pamaxidapezij.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/50394145980.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/sexosenusidifeviwuru.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/waxudi.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/gotozijubumadawawugar.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/gebujorivewejunizal.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/vosililitepaxalif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=aladin+2009+full+hd+movie+download+720pPDF 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_off0000b358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6A 15332 bytes
SHA-256: 9be03e03112b0b4b80e4d55a8faa7c247de7fd14481a568a481e968cb80afb6f
font_02_sfnt_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 11088 bytes
SHA-256: 4f578f53bde8c76a8cbc58dc7cf24ead4835858f7c3da83e00e3c5814ba9fd4f

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