Malicious PDF — malware analysis report

Static analysis result for SHA-256 db02cb92a0dd9dde…

MALICIOUS

PDF

101.1 KB Created: 2021-09-02 18:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 88049a5f6f7ba6c9184c113704a94a77 SHA-1: f369c0fe08769fe100093bb9d57822df9a5e455a SHA-256: db02cb92a0dd9dde4e31615294e1e99a62d4f3558c6ff887611c6e0a72a75aa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a potential for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://bodykneadstherapy.com.au/ckfinder/userfiles/files/bozipu.pdf In PDF document text
    • http://salonorganica.ru/upload/files/gemiwimanamagefamopal.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/jnnfju5sv2nr0ishta5ahhs5rs/85371823578.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/lewagogirepekokasepizi.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/vowosufuxatag.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/dolimu.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/81983101496.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f300558fb4---kinevefititi.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160908de5e7f93---tewebimijunuguseseg.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/dilalurugusatepirozefiviw.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098906bec352---sowuladizuxewokalevepup.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/335036c1bea03f111e6216937c161fc3/feludipisutabixokezix.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a0382780d49e85b47b20be5bf669b33e/pakomazorekepub.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da08325dc18---85743722057.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/parezozoxepotowu.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/pidetopizur.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/bikawedirifu.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/xiroferuwuwafujugeliv.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/38178966257.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/sareronomibizokojokemazur.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/8sgola38e4uheukhcq73cpr13k/sixebabejisasozowiko.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/93653413953.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae98df62394---36673303842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=maria+tereza+sadek+nicolau+maquiavel+pdfPDF 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_off000123d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D8 11240 bytes
SHA-256: c11ec7957770fb3f6312714d16b0bbb4715faff55ab997c75f8fb63613739d62
font_01_sfnt_off00013e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0B 18308 bytes
SHA-256: c343699ef7b8d6634c1a28897645a49e650af81dd5bec9d8a23a3087a5c425a1
font_02_sfnt_off00016d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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