Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4ba4158221afad…

MALICIOUS

PDF

89.9 KB Created: 2021-09-03 15:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a3ca8f87578c2a6d7969e522bfd3e50 SHA-1: d63e2250ad340ca4d086a2980ee595f304668d5a SHA-256: 2f4ba4158221afad340cd07f3c8b1fb426426d9e0f4917b04147518914bd1c10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb6df9be6d---91313867266.pdf In PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/reminulumituxipuriw.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///pewilakubawatolosisu.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/xedajepebigepigo.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/pigikemitutudemeboponuje.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/5586112498.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b185f8aad7---mipemezimexadekoteliw.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/28032177378.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/95536796583.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/18a3302833ac9533206936b3561d4e6f/xofubefadaxawofuzudunoj.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d5e9795170cf6599ec8f18776032f682/36361173120.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///jonusow.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/80087856758.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609050ee2b18c---sawubodaji.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a445d918090---79322389316.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/rr322jqohfin1e12vetfp2ef53/fobegenu.pdfIn PDF document text
    • http://sun-eko.eu/files/file/1414060681.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210706074858_639240048.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/26732377953.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/72128302239.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/tubegofipedi.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/dugumusaretelulur.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/zumujuxizisakisexed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=nta+net+social+medicine+%26+community+health+book+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 18368 bytes
SHA-256: 7df264bdb28221faf15ebdab71c63ca8edea1f411bc4ecff7c30c53a061d59e5
font_01_sfnt_off0001291a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291A 10408 bytes
SHA-256: 1cd2f3677260bf507b2ccb69703e737310bc303d099306d5b8f5158970297513
font_02_sfnt_off000140a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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