Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2567ae86ee019d2…

MALICIOUS

PDF

87.7 KB Created: 2021-08-21 10:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 62406ca9d16cabae07019e0a125600b9 SHA-1: 6bcf5eae1695cf63636762dcbed97dc54106cddd SHA-256: c2567ae86ee019d29ceacbc9619bb2dfaa85ff02c42c09a18b023fb5e1608c0b
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 URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the attack pattern of redirecting users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=oedipus+the+king+summary+pdf+download PDF link annotation
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/a14453429a5639ec6de2eac467210afa/57051646485.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30eef7a541---pujenawazozuraxudimeta.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/livakedudex.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/75007712900.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/3345624313.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/fonebogoteluxot.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160899129bbfaf---babuxiladubezefalogisek.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/jewilojowib.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/np3tmfo26s5oq9k4l8m05pb7ht/83386474658.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/63644701841.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/33773932260.pdfIn PDF document text
    • http://ubest.ru/images/file/sositefe.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/57356568990.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe3318368c---sigib.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/fekufilaf.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/vamiki.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e437ce4ffe1---suxisesazexepizire.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/japiwonenusenoripepapulax.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3344b732a---24082320141.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fc50be17706---83547280235.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7a093eeb7---lefaba.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/wexuteferovusolakulipig.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/dokosurejivoziwogakiso.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_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 17080 bytes
SHA-256: 050b9664637cb418e306848590fb3616d1bdfa02ad2e97ebfb36395f06e3a9c7
font_02_sfnt_off0001358b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358B 11364 bytes
SHA-256: 70322224d673fb7398fbbe54292099d07b729101d0b7a325740297e97965abdf

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