Malicious PDF — malware analysis report

Static analysis result for SHA-256 502003e7aaeb0dc4…

MALICIOUS

PDF

78.3 KB Created: 2021-07-31 01:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a1b1e3f3b091016542bf538da31e9c7 SHA-1: d645298d2b3362cd4bdba160f90f4117a1f040d1 SHA-256: 502003e7aaeb0dc43de3c690afa4c548e5641beed40e2a73bfb7e98120e41f57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's designed to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

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 https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/42a9bf83ed73fadd5d26e3e25bdb36e6/fabifinopejulubokegivowav.pdf In PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/93488855008.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c30b1df862---bifokos.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/29798499725.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/donupepezujebixerakofofi.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/41543854137.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/822b6cffcc7b423ac0b84468bdc7ad6f/26457349480.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/e372eb33327f62bc909cb6410649cef6/28586818342.pdfIn PDF document text
    • http://mywymc.com/userfiles/file/bijativojuvubimibudo.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a37c5b5309e---suxefosuxabuneluxuzu.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/39332939085.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/varubofanofunupodore.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/bomulomoxojoroxe.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/607b218081985ff912591698fdabd949/64642957385.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/6sl1poe3fua0lgjuje3ashgutm/44894868709.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/fipogafudijulavivakawuj.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/98959597896.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddf9091ca9---fuxuwavux.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/1f3b1f46b0906b1ec880bdf78641aeac/samafuwomizetizesezusud.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/8fe12af0a5caac2fa52e6c1163948d4e/sobekatalamovux.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/b9d2b7fe2361cc29c31eeee19ade4a42/kinuvij.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050122280673499.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160e644de8030e---38884273841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=se+pueden+recargar+las+tarjetas+ais+desde+estados+unidosPDF 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_off0000ccd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD9 10996 bytes
SHA-256: f9514fa63d37ca9fbd1c043e0245fc701bff7551a2b0b8ca75f8935d1bee2550
font_01_sfnt_off0000e63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 16856 bytes
SHA-256: 012d4045afbe7c5f40b8adbfa4c1a5202756c5f3a8a0ebbc0d2ae7d4a98831c1
font_02_sfnt_off000111d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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