Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05be1ab8ceebd9a…

MALICIOUS

PDF

89.2 KB Created: 2021-08-03 23:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b57a281972eb5707c9d49308f9a40f1 SHA-1: ea06cff937a91f96055431bf28809453765d6cb0 SHA-256: c05be1ab8ceebd9af1eb00087b58d0766baa1d75576ec4ea3936a58591976ed9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=how+to+reseal+a+pop+bottle PDF link annotation
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dab97e2de5d---zolofisezopupit.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/pizurinamojigerizom.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084435e5fcbe---tuloz.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/c69suo34uoce30cvhfmk82alof/matesarar.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/33723045497.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd31e0d8930---binerufinokejobafoza.pdfIn PDF document text
    • https://europartner2.pl/uploads/57944859210.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/f8f8b4fcaf702465efe0c7d7d7eb1ec7/mikapumuligotoludavukis.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/513625758.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210619220513767626bbphuy9fdlmy.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/60835874155.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/74992093732.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/matimazufawuxuluwu.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/63043787984.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/26316694589.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a351275f72e---togurisesepip.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853ebccc326---97341755275.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/3957f01884951daf0804fced5f936dcb/nogekapazilotuvudojunad.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/sezezedufefomugasipawov.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072a004d2d43---29832058407.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/2397782130.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608103e500dfe---xovozuweri.pdfIn PDF document text
    • https://lapiadinafelice.it/file/wowemulegefewefixuf.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_off0000fab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB1 17332 bytes
SHA-256: 677482e2f9f997a6e331fde941a4a39ad38e797372f5b3ca0db444b56ae7d671
font_01_sfnt_off00012829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12829 10264 bytes
SHA-256: b97d5f8569b5ef59e5d19509b1d42493186d0b6cd42d08b16543d1d8271b992a
font_02_sfnt_off00013f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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