Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b835420251c767…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 17:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff0bf361aabe83d77d41974585d49537 SHA-1: f9af8fe8b882a7da872ba506adaa0ca924dc23d2 SHA-256: 43b835420251c767b915260558cff188f5f057429bafb8722db9c28668d133a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=astronomia+roblox+id PDF link annotation
    • http://shmgec.com/Uploadfiles/files/selapi.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/fugateru.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/mudulojezuwej.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365e4a0ee89---jasex.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/67032433701.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/51301634560.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/rozezoxesebodanefuw.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398cb860f50---76155619580.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/gogomemumitukifemu.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/towutojaradisuj.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/55466693407.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/zufowasabe.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/zeditejurebusekexobakaj.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/ce8p00bo3p0a465dv9v4q8ul17/buwavitazosotu.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/pajilabepixuruv.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/55248274829.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/gagotebuzur.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/zilazirosagoturo.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161412c4207029---doxuvefozupo.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/kojofodud.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210914095204646.pdfIn PDF document text
    • https://vestol.bg/files/file/53288395199.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_off0000dadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 10500 bytes
SHA-256: cce34c040ed8c916e79e8a22a858f196829e9f5cfae75abd31eeac82a0218a7f
font_01_sfnt_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 18772 bytes
SHA-256: 5ed30566df3bb1a80438c1da82466048bdcbf293adbf22572375b9d37eb168be
font_02_sfnt_off0001238d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1