Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a046f7845c8191…

MALICIOUS

PDF

70.8 KB Created: 2021-09-23 08:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 66b768b039d9eca1472e67b0649805ab SHA-1: 900ededc15323a061d92792ca19dc10f12b43998 SHA-256: 99a046f7845c8191ee457d1b83e495538bec5b380495023ce0cc9da8015d54f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the URLs and the phishing detection indicate a likely attempt to lure users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://irlanc.ru/uplcv?utm_term=how+to+have+2+clash+of+clans+accounts+on+android PDF link annotation
    • http://imosa.asia/uploads/files/202109082108239585.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/baf9db05fd24c863f86f327706edb76d/47664390759.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/75905166269.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/gekitifi.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/39978991306.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/614639f675b6a.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/2d74401ffcc31e89ca5e26c2e7dc1ed5/bodavegaxurojuzidinezog.pdfIn PDF document text
    • http://texmet.pl/userimages/file/xodorurepore.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/99843154907.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/norenaxoxijap.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/jatel.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/73811640049.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/gaxusebukowuzigaribusepad.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/92420034767.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/dukodoluxulibijolusonugas.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7425c8ae4531d84d9aaebb0e423243db/28520016695.pdfIn PDF document text
    • https://xlquality.com/userfiles/file/muvugoxasixodigofovomu.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/15377637977.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109161758259300.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/nifibe.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/difopilididupikagefutima.pdfIn PDF document text
    • http://salespate.com/userfiles/file/fejinuvemuworufav.pdfIn PDF document text
    • https://btegypt.com/file/95315292465.pdfIn PDF document text
    • https://strechybenesov.cz/content/ripufipenel.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/mukimuvipusovimuxapitivu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161347366cb311---lilolopidigudironup.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/91822256533.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_off0000b685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB685 10936 bytes
SHA-256: 751c3f570272c16e1e044fbf93807d7ccf66edffc7078d1a795416eec2f7a2ed
font_01_sfnt_off0000cfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE3 14596 bytes
SHA-256: ddeb999aebedfbe00f4fe24c797cdf12509f1c2d186ec99474b85e7309625668
font_02_sfnt_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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