Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b34c091c1369f3…

MALICIOUS

PDF

83.1 KB Created: 2021-07-03 04:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5493f7939a7e923aeea572c296a17133 SHA-1: 900ff76ca2b1327c9bb42f17eb34910677f6f96e SHA-256: 75b34c091c1369f376216b7898c3e00aa64e65aef68662b07370ebb10990abe2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised WordPress sites or appear to be disposable. The primary goal seems to be redirecting users to potentially harmful content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://unicorn-furnitures.com/d/files/91022693139.pdf In PDF document text
    • http://matras-devison.com/upload/file/78331659540.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///giduvawufuzeputuvevola.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/52210025174.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/90059879025.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///zepulozupupaxate.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/3acb3ff0080418471cdf32fc8b21478d/tubakuwarazifu.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/88027594177.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/82296128192.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/fg50t1klfmm8bu2flpjdpfp180/66065371544.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/25344388571.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/palimumesonuxomifanipexi.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077a0d827f4f---futorure.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lumumomaka.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7929d8035586ff71182ba3a5fa4e125b/35923994206.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160756ae88f78f---jipebexonikiwodexogexuw.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/7c374d62beddc4832ea3af13e3e6b28a/vedowamuguxilovudel.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160827006cf0f0---zigawakitotenabuj.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3435f17dd---68911564102.pdfIn PDF document text
    • http://midel.me/userfiles/file/6767638874.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ov47ra3sqpsi3cght2irjf1q46/jokedejebuvaxepofaluwi.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843a0c349a9---56278605490.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/fimebonenasidi.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/xajimoretetufilera.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5a697fb1c---96699086085.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/7ea21bc47c3b180e3b61448da6047506/7389999855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=1ms+to+hzPDF 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_off0000e0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C5 9752 bytes
SHA-256: d660ca1b7442bae505e9a3090f582728505a3c35331141b4dfffd7ad51b0a007
font_01_sfnt_off0000f620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 18632 bytes
SHA-256: 3fc7dfa805512e03a9d5e45cd6646148bfffd71e5db1731dcb8cf2294b5dcf97
font_02_sfnt_off0001276c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1