Malicious PDF — malware analysis report

Static analysis result for SHA-256 783da34140cd7fba…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 23:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1c14ccfd1c8e802dcb11e38501ba7c53 SHA-1: 8b9ab92941559990f049396bb2b4548de7d02c80 SHA-256: 783da34140cd7fbad400fc2769dbfe9897adfabc0b7e873af7e654e19375cce0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://inwebjor.ru/uplcv?utm_term=minna+no+nihongo+chuukyuu+1+pdf PDF link annotation
    • https://wecareu.net/ckfinder/userfiles/files/61603055208.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/84595661924.pdfIn PDF document text
    • http://totoumi.jp/upload/file/zesor.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/kupurepugemefav.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/kinosuw.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/zokum.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/80655850319.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/kadika.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351f286f9f7---zurusakezezabus.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/22946778954.pdfIn PDF document text
    • https://armenia4d.com/contents/files/84625719812.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/9181e136d54d4372423159ddad0842eb/55634429088.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/92284533514.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/1fad7711f5551c5f291736a5a6f2068a/13682948324.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614743289f289---60229437543.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/14133174829.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161317d8962f73---zexakarevaxusuroxaxet.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/jivipipuwemaximulepizevo.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614769e886fb8---87736191725.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/bbe7a60321ce58270aadadb9d6a9c0ef/13047470748.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/13258338871.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/tevize.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59734157649.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_off0000d28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28E 10704 bytes
SHA-256: f03f236a7cbd7989c4d1facdb3573227c3422c163bfe0a0d8486be39ad046a21
font_01_sfnt_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 20968 bytes
SHA-256: 95488868f81fe7aaf0717af309a61b98f376cffa61c2e0a4b321e9a14f7869a8
font_02_sfnt_off000120df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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