Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f57fd8d44838f3…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 21:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d473ed1c148888c5ffe2af37b784b955 SHA-1: 9e0ce1216b9e7dbfdf17cc50b78b214a41e5c368 SHA-256: 93f57fd8d44838f3cd79633942a65ce077e9da939cc665adb1426ccc5b86fa97
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of numerous unknown URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3104f77253---mowedesigadejebox.pdf In PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/kesigulitanujawugufiwad.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/21388910485.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080e6e3c2fcb---8763917675.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/nudopiwegamobawenufonab.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/63473474643.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/54148407350.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/58338856930.pdfIn PDF document text
    • https://ayurmitra.com/files/file/99960533805.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/945um76lur0kkk5nmnfqu8avas/3356468831.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/41597919442.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/vegutaxan.pdfIn PDF document text
    • http://nakatka.com/files/file/58826251179.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/00jt0hc3pbmi2su7ls1c1g7ar4/37899803170.pdfIn PDF document text
    • http://imaginove.eu/data/Files/62883162622.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/260938457112.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/40094143090.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/38458303959.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/karadedutatowulijedav.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100690d6b0b1---96658774928.pdfIn PDF document text
    • https://bloomeng.com/uploads/jojojigis.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/kimeremorovilajivulu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161005f08cca89---tigub.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1d657be66---dijetikumikajibopozomin.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c117781e2f---gewutenuzisope.pdfIn PDF document text
    • http://beiks.info/public/file/71539059602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=calibrate+thermometer+ice+waterPDF 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_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 17616 bytes
SHA-256: 7336653d21782bdc25bfc5b7987d7710bb33b6fe151a9c9c0f4b7bddb44f7e63
font_02_sfnt_off0001285b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285B 10480 bytes
SHA-256: f39fb63003fe396ced08be810a091db093a8ae0bf8c19ef7b14de9ad0e45e36f