Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a06fdfad318cb4c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-30 10:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 017ce305c6537d3d7c7cff7cbff31f93 SHA-1: 0699c90f78703bf151772c7f32a0647d7696c79e SHA-256: 8a06fdfad318cb4ccd389413b3eac4db5bc29994cd48231a9993812c382c2021
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic points towards an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=minecraft+story+mode+apk+all+episodes+unlocked+android PDF link annotation
    • http://proximeo.com/ckfinder/userfiles/files/napasumuzido.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/vulamufebawowemimiwox.pdfIn PDF document text
    • http://eventechsite.com/files/files/boverisizeno.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091414121834.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/xilikabomajokal.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109261612097196.pdfIn PDF document text
    • http://metabolit.ru/files/file/13843225107.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/falexasawekewofazap.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16149108176068---jowot.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/51241137885.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/2579552051.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109291631565905.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bopuxipuve.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4670254711.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16153e9abb2262---dadeje.pdfIn PDF document text
    • http://theponghop.com/upload/files/vubumalawojap.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/kuxilajorawetirat.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/dukijolo.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210910065344.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/23304538299.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/83af05624c2cfd68f8b4adf82b241812/22667034736.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/taloninimisaverinesirive.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/81436886685.pdfIn PDF document text
    • http://newworldss.com/uploads/file/85569852074.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/krattrc5o2g4h6j87ik1n53r8i/pefomoza.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/foxose.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_off0000b4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E1 15532 bytes
SHA-256: 78e5e6c5044a71be5339c575da3fc176e784d04f4d4b7685a97184dfba489ce6
font_01_sfnt_off0000dbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 11080 bytes
SHA-256: c04ec543abd5642c36fc6cb14b6a1735a772efcb3b871cc315cbfaa29142375f

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