Malicious PDF — malware analysis report

Static analysis result for SHA-256 b034bbbbc909cc80…

MALICIOUS

PDF

69.3 KB Created: 2021-09-18 08:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 995c92e9e2eff8c8e5fe7ef656eb1bda SHA-1: 96649e61ff00541ee8a376f4c6990a6a37776868 SHA-256: b034bbbbc909cc808a41dfb89e1ea76b85e6d0096ff4fd080c9c2cf7812e3fc5
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms on disposable hosting points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=how+to+download+new+apps+on+firestick PDF link annotation
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143b0aa8f691---91280083102.pdfIn PDF document text
    • http://aibrpjoaae2.specialty-match.com/upload/files/34973015139.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161403d077796d---44556576165.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/85563331954.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nupekanekixose.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/xipinedamovubasanokowojo.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/8c080fd231e9560910a9dc7ee499c07d/ziretikisugus.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/3621381671.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/47665612771.pdfIn PDF document text
    • https://ms1oke.com/contents/files/figilewatulasisezibuwarop.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/52105952302.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/44582456406.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/43012186004.pdfIn PDF document text
    • http://cobmedia.hu/include/pabutiralanudepox.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/potigagosadagutiwif.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/paveku.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/8521474744.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f37fecada---28261323644.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/besomerovotiturivutibigok.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/16090793321.pdfIn PDF document text
    • http://tencanpowder.com/d/files/pibezejas.pdfIn PDF document text
    • http://weshare.vn/attachment/files/87202346943.pdfIn PDF document text
    • http://konberdbio.com/upload/files/gabaki.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kiruzuzebupetafujaxabidab.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_off0000b1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA05 10784 bytes
SHA-256: 1184196a3827c14baae2c5dde530c4154e2d91885b841a34ff2b6b9f500a1565
font_02_sfnt_off0000e2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F9 14676 bytes
SHA-256: eb52c7d5ac522a77885e0b5be1afa98a0d30005b56907dfb52406570380d7ea9

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