Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aefc77c7c53b5ba…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 00:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1f6e729941032e115fef4b88f8cf36df SHA-1: 4ca8b7f2c5cc513995ca030492d474c69f0f3de9 SHA-256: 8aefc77c7c53b5bac5ab586297920802a13f698e85648b6d3f6f891d29f7d19b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to lure users to malicious sites. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism. The embedded URLs and link farm structure indicate an attempt to exploit user trust by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://praconsulgroup.ru/pict/file/56892631903.pdf In PDF document text
    • http://fixafilm.se/userfiles/file/pizavotapedigegixu.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16100791877a75---94626220613.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5366cdc52---vaduforuxuzedetadopidebut.pdfIn PDF document text
    • http://deltools.com/userfiles/file/28589861262.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/pibijaj.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d547117206---sopatokonagetexofimap.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/40627961721.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/34474816131.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f286101674---zebajupoduzog.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adafd1868dd---30466705748.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607882dc733fe---81043659915.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8190693b3---pijazulonanifefikafudi.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a75071d56bd---88116140025.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210629_AD37E04461C6057D.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec60740936---voxigaduf.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/bukojoxofafupeziki.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/12822773683.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/64355935880.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/7872685448c116a58514e17e5a0d1929/moludupak.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/89849274335.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b8536dab88e078c0e2a4441f539dcc29/nivekaled.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/ff8c5f5c3c5762fef9a6187de102b4ef/gamemogavojidemib.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/3ce3462ed1d1143f35a74abe63623649/75120339393.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd7c852859---88476611824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=c300+mercedes+2017+manualPDF 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_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 10868 bytes
SHA-256: 2f343fe8cc5478dca9f6d05165f9b26ac44d95b5ac6bf6cf50a58ebc6434ea93
font_02_sfnt_off00010ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CED 17832 bytes
SHA-256: 6f5bc3035b1ba0011b617e94bdbd9ce0e7067744ea926ac5155bcf8e17a7149f

Open this report in the interactive analyzer, or submit your own file for analysis.