Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d49b333ac168896…

MALICIOUS

PDF

73.7 KB Created: 2021-09-04 13:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d3435eacff02b74d32a3a555e5c4ddb SHA-1: 08d16c6cbc5cd14c2f272722c92f94b31f866546 SHA-256: 9d49b333ac168896122688c282b509534d8ab9978ca0ea595447740f082c3151
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://curewelldiabetes.com/userfiles/file/zetajufuj.pdf In PDF document text
    • https://hocngoaingu123.com/upload/files/xuzuxujatubadegefoke.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/kilomarolububixokesij.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/j5l86r08d1q2fgc6fakvkovmbt/37962780633.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8f816e2c1b6e9f550961eb6d131c19b3/tizisusowevoz.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/e438d17afb9d1a7bd58324108704eafc/84304225190.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/26027550e51587e40d0d0f9e1ef43e1e/85495010613.pdfIn PDF document text
    • https://orrizon.ru/images/file/1811686778.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d8b36dbd588980aad49bb5b983f31aed/48657756925.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/tepuwunevojozirolegoribax.pdfIn PDF document text
    • http://rentaruedas.com/files/others/25353895600.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/nepegazuriboda.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/63756178808.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/magox.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/885f1ece4dcbaca6d5b3f454adc8cf1e/32203007071.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/63130393493.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/95790890766.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/82012506243.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/mawobuzugowulemikiligi.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/36975957957.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/61933591599.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a315f45a8951cc4a7af9260089a02e96/46104095348.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/8a813f73fead7dfa6cde11f7a822c83d/dibazixisejuporevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=mi+proyecto+de+vida+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_off0000bb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7B 10468 bytes
SHA-256: 911190014e680456cb18d99ef2107fa39743ba9aa9af5676a39d72474f41627f
font_01_sfnt_off0000d36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36E 18376 bytes
SHA-256: b9090fa25e3c2460c9dac75834fd79496a2be67262cfc3852db04ed620ad4efb
font_02_sfnt_off00010194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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