Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b7a27e78722dd0…

MALICIOUS

PDF

85.0 KB Created: 2021-09-10 10:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1ba8f8ae2af5dcbdea495f1035db9f82 SHA-1: 66863cc5249babdb6ffbe442104ca6012611fa95 SHA-256: 94b7a27e78722dd0b784a44bff98d7989112769f07beeb37be51dfad51fcab53
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests it's designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://maychebiengoduykhuong.com/media/ftp/file/78078530874.pdf In PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/rupuxegub.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139459eac887---polipafedusozumujibo.pdfIn PDF document text
    • https://viettrungson.com/media/Files/84008521802.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/52857549503.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/om267v84uif1v0rs76btkf5hre/73524031603.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/vodiluxomorasewog.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/27655856954.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/13048920609.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613907ad5f526---39510327727.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/66423679927.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16135b427980ed---26626848883.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/98825122436.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/poropajunulubove.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/dovijulixaboviwafimu.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/41878968206.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/mofebibuzofaxunebu.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210901231010.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/rupem.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336bebe0809---54240364833.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/48563209708.pdfIn PDF document text
    • https://loyd.rs/images/file/24905473207.pdfIn PDF document text
    • http://fteq.ru/files/file/bonijovufiw.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/subizexukiwokekekilim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=my+laptop+cannot+connect+to+my+iphone+hotspotPDF 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_off0000e46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 10648 bytes
SHA-256: ca1f6c984b1b655473d362234c54d1bf1e9dfe47d42152058d9aea6577dd9148
font_02_sfnt_off000114b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B8 19004 bytes
SHA-256: a8211d2bdca3f55ccb78094241b3253af57c9ee1e778ddb4a54900fc96931a37

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