Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8cc78ccb9700fa1…

MALICIOUS

PDF

88.2 KB Created: 2021-09-16 17:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3635d45be1114ed5c16f2f49c61d7662 SHA-1: 3f165af8717305c36b7301168b320dbcca3ef690 SHA-256: c8cc78ccb9700fa1e9accb838eadc9a88ea3fa2e37e5c2767b1ea93632a04884
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains a link farm pointing to multiple domains, many of which are associated with compromised CMS uploads or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kitigedo.pdf In PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/konexujug.pdfIn PDF document text
    • http://lejuriste.ru/files/file/vofomesibujiwifobobusiko.pdfIn PDF document text
    • http://arsvet.ru/img/upload/walatatusuwoxapuwi.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219131910123609.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/jisuraniki.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/22488899876.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210908172901.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130922d2cd24---1082620240.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/vufetoxi.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/dixokopesap.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4cbc5ce1e---lemipelozivib.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/fimisemuzekakozidepo.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/33242546409.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/45039524723.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/losen.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/97945564533.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/65132762809.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/83400503884.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/15030672199.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135c021566af---43569143418.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090723570688.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/89077002546.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/87770527206.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/64895356625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=best+free+android+data+recovery+softwarePDF 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_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 10740 bytes
SHA-256: d8824f5060051990406e19bdee93ba880a945f36e3f27f71c3a9a74744363537
font_01_sfnt_off00010ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA7 18044 bytes
SHA-256: 6cdbc193e4b7b8d4e421a3a06183fdd3155427a96d464c67bf6241a441d864e8
font_02_sfnt_off00013a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1