Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbcc5d19b902609…

MALICIOUS

PDF

86.5 KB Created: 2021-07-01 09:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ef2b406bd3bee4355360103b268911bb SHA-1: 9faa5fb6c49c8925c1b893d8ed5acfc927231c6b SHA-256: 1bbcc5d19b902609a828f2083ee100fddf1356bf70dffa4e3cd607671c1df6ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and is identified as a link farm, likely intended to direct users to phishing sites or download further malware. The presence of compromised CMS upload links suggests an attempt to leverage legitimate but compromised infrastructure for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://medvor.ru/uplcv?utm_term=two+guys+one+girl+and+a+pizza+place PDF link annotation
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/4e434d335438d1ad4e2b6a867d8a119d/megagu.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/55324429322.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/6a2eb381bb55e5310d10f495ec30f3b3/dikapexi.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a8723994fdf8c9d75eefad2883d9574a/vigivizeronosexuwosid.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadf8d2990---53965234033.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216201029227022.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/18899881495.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/l9dvm7qopktuqf50asi2lkv152/26653109135.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/hfs5ng4dvrplrbqo7mesqesucq/80854926971.pdfIn PDF document text
    • http://kotolantopeni.cz/file/dusubalapowidifulekufigul.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080ddca33afe---28232923862.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/riful.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/31432402962.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c93eacf9a4---datuwalaseb.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/12631463732.pdfIn PDF document text
    • http://metallpress.info/files/5613567976.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/lobufusuzizefekoze.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/dad7945f4683d90cdb90bc60d1861211/84088094734.pdfIn PDF document text
    • https://puppometalli.eu/file/supuxuluvasofipofok.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/4281540333.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/jaliga.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/ruzadekewuvara.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/ec3488894566f4a7a93099e24cc3d3bf/39365317758.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/59757695358.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16094882d9cb47---jarasewogajora.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/fajijunap.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_off0000ee12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 17804 bytes
SHA-256: c7d3d1088ee347d30b27b465b1d31ef5f04689769eb8ae7399e25e81b9e6e5d3
font_01_sfnt_off00011b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3D 10912 bytes
SHA-256: 6486d9d09745a45c31bde145e9cadb51060c11a318d9611ea7e592c29bccb136
font_02_sfnt_off00013488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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