Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bce91d963b1544…

MALICIOUS

PDF

86.2 KB Created: 2021-07-01 11:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f5952857c679581ff3122077fd0e310a SHA-1: e46c2a13d27ccd7689cb0877bec22006be9c3d05 SHA-256: c9bce91d963b1544e07ca18a3047e9a41df45e48054ce83641b1fb983efec794
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm or phishing lure. The presence of external URIs and compromised CMS upload links indicates the PDF is likely used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=analysis+of+data+in+qualitative+studies+attempts+to PDF link annotation
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02e2b8bf8---49043934680.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/59817650893.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dc17b2719---78553269590.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/zawalemevabajigotane.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160733e3014c6c---89991315561.pdfIn PDF document text
    • http://praguetransfer.com/files/file/movovepunek.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/kadigunefesaronif.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/be2a45a3deaae660540d6a5c8bf93943/40980426068.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/89214101287.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096854b85ea0---95598287272.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/savitidagefo.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e29d55759b3e453eb7a6a312de8c3514/55792948948.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b58f376fc24---badexafefatak.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/geduboboweriwanazazag.pdfIn PDF document text
    • http://springbook.no/files/sivekowafamumumiraf.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/57783805960.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ckhkkj8bssj153jkvctilp6qdr/kimupor.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a47f122cd---12574083528.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/dolofowulifamibosekonalu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075b87253c20---panomuzejavovizapi.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/zutorakemigigibusaziwofe.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b787ddfe7---89060935821.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_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 10964 bytes
SHA-256: bf401ab1f99f66c56aa758805a25272ba617df9a4b60c50c310ba7b4d199ea45
font_01_sfnt_off000105d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE3 17640 bytes
SHA-256: c053a0574649b2556820dbb5e437cfe52f48d0dc7f3e425cb0f080dc5cdb3eaf

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