Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b0b4b32d49fdaa…

MALICIOUS

PDF

80.4 KB Created: 2021-10-07 01:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1c15326cc8075ddb720124154d38a2f6 SHA-1: 684342abe7358ae0cf4f19e75d5093af46b8c16e SHA-256: 31b0b4b32d49fdaa3a0d02c588246bd57d9435f3e996e96b12c94350d5d436d4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5815

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://boschvietnam.com/files/usersfiles/files/79250261982.pdf In PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/keroveloxowedosefinu.pdfIn PDF document text
    • https://andrejc.si/files/file/23688366448.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/67237665331.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/21309109439.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/37374760046.pdfIn PDF document text
    • http://webursitet.org/Files/file/mexavevuwud.pdfIn PDF document text
    • https://gsc-tw.com/userfiles/file/46581729653.pdfIn PDF document text
    • http://nova-auto.com/upload/3381707583.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/8110572396.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/58245511596.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/bapiwosuvorapobaso.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9aac81196e9f903aafd1bd5f692f0da7/fefom.pdfIn PDF document text
    • http://goldmustang.com/files/files/67778738640.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/31553152471.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/kubosixiremirofinafa.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/luwimawup.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/87437597100.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/supolazoxapavewaxukiremo.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/zixawigamomodufevitaroro.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/tevumasidigikusuvogozi.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/bebutanuforubimiturul.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613240bb8ae4b---84248336550.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159b58cdb872---nivunojiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=screen+recorder+app+download+for+windows+10PDF link annotation
    • 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_off0000de56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE56 10852 bytes
SHA-256: 848bb6e942c6a5f222449b000c739994a0963579738133993ebc70ea3933b38d
font_01_sfnt_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9D 17276 bytes
SHA-256: 652e2a28105a9071833fe5effb93c40eaed86a48b38a6ca854041772ffc80631

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