Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f77edc29680d221…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 21:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 314a65aa87bbd200518db14b67fb384b SHA-1: 8e87478cc95975410a279a7d6c0ded450360107c SHA-256: 2f77edc29680d221f05b0e5c160fb24451b6af058242e4403f74470cff376f0b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically using a password-protected archive pretext to hide malicious content. Numerous external URLs are present, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute further payloads or redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pixomot.ru/uplcv?utm_term=como+passar+os+contatos+do+android+pro+ios PDF link annotation
    • http://caythuocdangian.net/images/files/58738758807.pdfIn PDF document text
    • http://baove24h.info/upload/files/balubukabinafed.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/totewabaletiboruxajilopop.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb0098ebb7---wolajisepunoxodopeze.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413ef155cf7---tojifovakolisipuposoti.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/vepomekonim.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/57909279543.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/4334628476.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161356930e5575---12306752101.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/nozijora.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/tutazikijoximi.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/51227283916.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135b05895707---10412614125.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/17119046842.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/fivafu.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16144a29062078---wapejuxepirupuvodo.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///13412422544.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/54557406711.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161331f8a3ee06---dosetasamuromonasadukeke.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/56f5462a3f91f6305e41f2f6d7ccabd8/mevosatemogagolumomipomi.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/56605881038.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161331d70abdff---luxoxikevuvadosajajalam.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/67069126543.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_off0000dfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC7 10528 bytes
SHA-256: 4f18437a6b63209616c2fca6d0e32a8838a08de2a20f4db4af546c38530f73fa
font_01_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 20724 bytes
SHA-256: 57df20b0e57e81165b6fad28941cce9c825b05790f85dcc101afba31ac7120e5
font_02_sfnt_off00012ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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