Malicious PDF — malware analysis report

Static analysis result for SHA-256 63dab08f017b3dd5…

MALICIOUS

PDF

91.1 KB Created: 2021-09-18 10:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cf2ad079aaad04dc45395edf60b9a333 SHA-1: b1badb12a32dacff2b32a8b6f92a1b3164d022e9 SHA-256: 63dab08f017b3dd5e1b3834922d50cdd8f54a7b17b7ed70043c44b1e084152ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs further supports the attack pattern of redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://catamma.ru/uplcv?utm_term=7404+pdf+datasheet PDF link annotation
    • https://alaqart.atelierleuthold.ch/userfiles/files/16141591617.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/bakozik.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/82190374549.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/44341622776.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/38667622962.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/26626933898.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c545c4ef37---86300162450.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161372d82b1424---63389146916.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/56229396586.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/27110302626.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/92573692735.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/86758284574.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614162763f079---99861579352.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/tafuwulisadabavulegapiru.pdfIn PDF document text
    • http://sushibelovo.ru/files/vajilejiriniwuguwijelawe.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/vimefabawusaf.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/fezomemubazanofoxowe.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/50973143520.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/fujebaramalagivumi.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/vujabibadelew.pdfIn PDF document text
    • http://patroha.hu/file/jujukaleval.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442e4c2de25---59140179271.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/24517426024.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/97259139297.pdfIn PDF document text
    • http://hocomesun.com/upload/gabusokosunulomolose.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf07ae66b---govonegupoduzuguxu.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_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 22400 bytes
SHA-256: 8e93a61e0b47a58bbe28eaf4a6fbda1a398be7b60250292e0dab036acd4a1c76
font_01_sfnt_off00012f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9F 10284 bytes
SHA-256: b0e1d3bcb306d8f58f1c39243ca32b34fbfd9b770f53fd14aeeab57aa1e6c739
font_02_sfnt_off000146ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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