Malicious PDF — malware analysis report

Static analysis result for SHA-256 92898887df1dc2d7…

MALICIOUS

PDF

73.0 KB Created: 2021-09-07 08:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6dddc84c24b27733a3c760a0fbae2d62 SHA-1: 7c5f930b76baee52df29b80b14cf92239082567a SHA-256: 92898887df1dc2d7d49987b1c131251d76a4e2d112f83f682ae2e968b69d9f7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

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://allytemp.ru/uplcv?utm_term=passives+exercises+2+bachillerato+pdf PDF link annotation
    • http://sabaispa.net/userfiles/file/59822366490.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/56c69a821508aa07bc07f78b24b8341b/80287298469.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/vukofivipapafefat.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091ebf959591---68156253237.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/relunukuzevajawel.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/13581791527.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e95c0abba26---70161045547.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16082cceb75cb2---pusiz.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075e42fb1319---garobaxezusamafi.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/90318447416.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/75299015971.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zekisotowasekijaku.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/65b25515f25940e9f1cbac25a0192d35/pamefeguda.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/rafeberet.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8fbde2f6fb---27243518739.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/genojefupa.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16084d056e7930---suzibigakewowinavakijolu.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/pidodisexabodalajarato.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/44552163535.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/89703352979.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/3h2q5a721rn4prkv9313i2knad/delivitu.pdfIn PDF document text
    • http://kco.su/userfiles/file/37322994975.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/eafc71ae31b060b56b36547aa3b4b131/nalisekubino.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c1166430bca5a55cdb6f28f567e5eb1d/38096150937.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_off0000b89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89D 11044 bytes
SHA-256: d97959a1dd1d7fe8f09b4a9d4d9ee634ca13c325f138ddc74d8d340abbc7c092
font_01_sfnt_off0000d257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD257 16516 bytes
SHA-256: ad333888fc87c29c895801bbbf86dadb7dbca06442db0722e8bf1a2e74f4608b
font_02_sfnt_off0000fc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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