Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4cb55b03c0d5b9b…

MALICIOUS

PDF

100.6 KB Created: 2021-09-06 03:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5306b3692588436ca47d12a33e8f5eeb SHA-1: a22b47521b2aa1235bfd8da92cb328bff65aa8fb SHA-256: f4cb55b03c0d5b9bd57e7cf222a86833838f1923c4a59e65a8ce03ca5d9da5a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The document also features numerous links to compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d394c31e5---80703234562.pdf In PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610f2cc17ba91---nojebatonajobilokenaze.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f70ab17a53---goxojepuzuvedelijalifar.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wetuza.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/wozuwenusafefitugumefaga.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/d0031e419c1508f798d274d62f77727a/15366033590.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/99701917738.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/dufeludagazaroroxumitagal.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/rivavuvekisa.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/sixukugagezazuwuxufilix.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/jalovufigofixorojifinel.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/iglulttsr9vtp4l68ljkuodil3/gelewusafof.pdfIn PDF document text
    • http://liyangah.com/Upload/file/15298937310.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/3249c0cb202dfe3ca935be0607756891/gibutenik.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/tazajeduviwukogo.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/94372904524.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/20308166984.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/626236cc64b139c284573e2ffc334677/mudusepadoji.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d392ec9af8---tisisifabagew.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/gugapuxuwanedubixoli.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/376c4a711375897bfbd8fe9536490d53/30447835384.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/32852406da2485bf65ab10856139327a/kasawedadirele.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/64063687537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=writing+application+for+job+pdfPDF 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_off0001222c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A43 10756 bytes
SHA-256: 7e4f069f7e2cfa7f317d89ea258b1384df72e3acc94d3a6243a0881a37d1d129
font_02_sfnt_off0001529c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1529C 19124 bytes
SHA-256: 7f1f0807f189ef92fece5866f41b062a519756d35af6ba80835c7501c3067099

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