Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e7957865af03f10…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 04:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d78b76b3a1474a374d848e9af24697c SHA-1: d29452041b84086c3d4dacec833642656c25ca0b SHA-256: 2e7957865af03f10767bd7b14f390cc85bda21de1b3cce543f7846148306d49a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, several of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to manipulate search engine rankings for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://coca-colalife.eu/userfiles/file/julof.pdf In PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/forilamexepodumixofa.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/66665924630.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/12931688580.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9c6e47b69---mowepezibebowob.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/84502495221.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3a8bc5b0f9343598c3d1cf0940166651/83848978215.pdfIn PDF document text
    • http://seritour.com/rsm/files/27922864679.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/tebineraretuvuwibesi.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/11533333008.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ftnnnj596pfph49i6sjlkpjnd5/fumuguvuvevari.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/masukufaxodukenilevebu.pdfIn PDF document text
    • https://allianztc.ro/files/file/luled.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/jiwez.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/ragibikebexakomuxamemi.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/19568807676.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/17727393612.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/lagawamuwumusef.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/kejaxupabodeja.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/46627797476.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/zovuxadosep.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/93806475805.pdfIn PDF document text
    • https://majubesar.com/contents/files/26583498226.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/2856879036.pdfIn PDF document text
    • http://orthopediedelft.eu/files/jepelaruxeropugakopamu.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/84541234171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sex+simulator+games+for+android+downloadPDF 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_off0000dc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC99 16676 bytes
SHA-256: b9ed88bb2148b9e70e8178f14d0a903997b68068d83869fca2b74773636fb994
font_01_sfnt_off000107f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F0 11060 bytes
SHA-256: 8e8c9c73fa96fd2db43e09224786c7662104aaf02cf7d14f1c87b0659632bf34
font_02_sfnt_off00012189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1