Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f6f67d9e33583f…

MALICIOUS

PDF

87.9 KB Created: 2021-09-20 23:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0175067edfe6a589ad6abc9395ff05e3 SHA-1: 2e38de1bbabbf38aa7b73501dfaa897fdc8686c4 SHA-256: c3f6f67d9e33583fbe00b383548bc80481b54e2c7c3f036b5bbd21c6c9a15e76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure strongly suggest it's used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://irlanc.ru/uplcv?utm_term=gomovies+guardians+of+the+galaxy PDF link annotation
    • http://holidayservicemarsala.it/userfiles/files/56047200105.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/kogavu.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/fc26489571002938865dc52b926a4344/bifatudugupizaginozin.pdfIn PDF document text
    • http://fteq.ru/files/file/74889784203.pdfIn PDF document text
    • http://domplus.su/userfiles/files/28654682315.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qbg42cnubga867mje87pgr8ked/fupoxumuzikuzokapaxogaka.pdfIn PDF document text
    • https://mashura.co/userfiles/files/10897113978.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139717be32cb---lelebi.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c48eb4009---wisikalit.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/28906751309.pdfIn PDF document text
    • http://marymo.ru/uploads/files/55394521635.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/limodogujifoki.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210901_AA33148F1679466F.pdfIn PDF document text
    • http://wjcopy.com/upload/files/95323310282.pdfIn PDF document text
    • http://beta-rc.com/upload/files/36358940232.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/muwopirovafagofunaxiwik.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210909_1CDE1C832B90A976.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344e1728ba5---56843826912.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/9587228817.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c45428406b---wonexojobogopekikiwiju.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/xiwudijetemeku.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b78ff6621eaf0e70b40d164a74b7af89/rasusanunepigukebavuvegin.pdfIn PDF document text
    • http://cycling-software.com/files/file/80411142950.pdfIn PDF document text
    • 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_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 11220 bytes
SHA-256: 91b55cdf6a4c57b2464ed18a5a315da68710bd8001d9845e9e42871b1d38e028
font_01_sfnt_off00010a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12281 17716 bytes
SHA-256: 4f7b00c83afffa7705cd7cebd9532888bff3c814bc0d5d9efea53b9fc7ec7037

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