Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf239ccc1828bef…

MALICIOUS

PDF

105.8 KB Created: 2021-07-24 08:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0f1dbebf6b30bbd087e1211cfc20eeeb SHA-1: bd01dd627cfb17e0d75196e8600e5618bb95178d SHA-256: 6bf239ccc1828bef6410e3209848b2895f3f322fc5cfff97c6817de64a5a2949
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that redirect to potentially compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of embedded links and the nature of the heuristics point towards an attempt to lure users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a196847c7a7---zosugisobo.pdf In PDF document text
    • https://weeb.nu/userfiles/file/9506326493.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fedfa4f608---10923096985.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/boranodo.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/28092633893.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886b2adb51e---13442733878.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/7ea95ef0da6a95d2edb04144a3763547/68179225347.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097091ede6c9---zomililiv.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/5l7d6o6dkbbcmijrdgfs222qt4/24477165584.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/20612196856.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/17972118665.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c833e144ed---7912523078.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/zibirisaseba.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/3bt4l25ufmgpv0ed5gq3ktv1j2/pizinibuzipax.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afa90b79d2a---85767501759.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/5fd99a29ff323a8153b1ac50c98c4aae/ganopodagukeb.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2620c765---varoja.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/kenajekodowamewotiwaser.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/f5760c6ffd459618802cb60d5072130d/buxarefas.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210707_051539_154.pdfIn PDF document text
    • http://balone.net/_upload/file///nedejewatupelomuwe.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/23941518309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=telugu+guninthalu+in+english+letters+pdf+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001054a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D57 5056 bytes
SHA-256: eb39d6a6c2f374e58a6b8ebbd22e484d5571b197f8f56e0ebfb944229a09737b
font_02_sfnt_off00012f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F74 23564 bytes
SHA-256: 4b94599cc0ae530bbf79ec17d2a9eab4c5307ca304aeebebcaa3c48c0f63918c
font_03_sfnt_off000168e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168E1 10924 bytes
SHA-256: d271a4b21204e9856d02a17da4aed02fccfd005ccaec6dc6fb0060b4b2e81485
font_04_sfnt_off000181f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181F9 16244 bytes
SHA-256: b1ef7b52ed35dfd01120c19ee4193d967dc828f2fc549fe1a2d8c3c5029b4647

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