Malicious PDF — malware analysis report

Static analysis result for SHA-256 338dac55c40f1880…

MALICIOUS

PDF

75.8 KB Created: 2021-07-31 11:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 302b1d092efbf5a650203f0786daa26a SHA-1: 119fe663bc6d5f40ff6f4ffd82790526ae73c11b SHA-256: 338dac55c40f1880deaf17d38a6eebf56adc159c849b3792045670efc2e6e0e1
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting sites, likely to redirect users to malicious content. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights the use of compromised WordPress upload storage for hosting PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ghioroiu.ro/sites/default/files/file/fitutomasanifavulex.pdf In PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160fa1cbcdd21c---juvejegumavawabo.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/10964948807.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/55242533444.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/a64f0451c27fc4b7f68b7aab62e664ee/81179588008.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9916b985ab---ludarimofaremu.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/f0f18ca8ce06abc8d0399e177d0b522b/posigew.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210626_95D7B793B2E41F5E.pdfIn PDF document text
    • http://ligneus.hu/upload/file/jifaze.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd7f0ef6be---18655195506.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/sajavufunegasizu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3b265ed2ce7cb10b270582ed567905c7/ribeponobidi.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/92531179a384ddb27b8dd708993d1f99/zirenotodazadorekij.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/9d29f5e508ac7cad70b66df2fffb2fb4/56254647030.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f8f372f9ce5d257058e3c2cd4cfce54c/nalanade.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/marowisazepobibi.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee4052fb38---lunukajakimemezawarabuja.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b70ea4245d6---nexosirijotuzixedu.pdfIn PDF document text
    • https://www.neosynapses.com/wp-content/plugins/super-forms/uploads/php/files/66sj73tfg44vic0hfpv1r7jamc/29097850007.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/16104348214.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ad00f8c98530f8b934327666d54655da/25845167875.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/cbfa8752cb776402497f1b94e4c392a0/kifesisesizorav.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/reburopovapajatax.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/v497ovheqad86ao86sreibt6vf/5751498682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+talk+to+your+cat+about+gun+safety+redditPDF 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_off0000c4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B1 16432 bytes
SHA-256: 6ce94e76ed3e54fe761c254a70c4468ecebb73cfd0dae3242cdc1aa7408b5a42
font_01_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 11172 bytes
SHA-256: defffa93d831008a1655bbda6200126d51943ce39aa78ad2a84ff5384ca54c54

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