Malicious PDF — malware analysis report

Static analysis result for SHA-256 0331e0bfa6f85502…

MALICIOUS

PDF

90.1 KB Created: 2021-07-02 16:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 39cb2e11294435254c2541726c828842 SHA-1: 31738b44690c0878f8babbdb5042a75155b31249 SHA-256: 0331e0bfa6f85502d94f4ed97c69d1d99359e6da74984d3863802aa4871ace36
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute phishing content or further malware. The PDF structure itself is designed to host these external links, rather than containing readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://oniceh.ru/uplcv?utm_term=5x5+workout+for+women PDF link annotation
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/rdsbcdki8ujo75gnlbf8571coutlc1sf/pirixinezitunefaxe.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/jizosadajot.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/57360280161.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607989e936bf4---77636688774.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/aqfl6pp8ifiiat3lu2p1k75utd/42172668130.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/42668684040.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/10826432231.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/360fc725a15710cff856cecbd4b7ae48/93887495104.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/45754961471.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/xisebofikamiforokewov.pdfIn PDF document text
    • http://tochalco.com/uploads/files/bovaja.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/55f6dab3b58f8eae091ce674a3273770/suxuzu.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/47375482369.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0a6263407---gagofetomenazinixuxazo.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d09a76e7853---36812246460.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160912a7380038---kasigedodosoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec5158ef88---vulexegopirorojanivi.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/e069fdb290c73fa18f0f5627920ce820/96681992573.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/zolunajagejuzovin.pdfIn PDF document text
    • http://praguetransfer.com/files/file/reviguzenesufitobenapup.pdfIn PDF document text
    • http://teresachild.com/upload/files/fukeziwovuwe.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/81159492413.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5320068ef8---77686589344.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_off0000fb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB81 10324 bytes
SHA-256: 84e7528a505fec751501f27a48dd3bb512ace71fd69de38eb81255cbeb83b485
font_01_sfnt_off000112e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E9 17832 bytes
SHA-256: 285111fbccbc59eca3ff47a117c3c6cf578f41420e77a0921fb49d58fd954583
font_02_sfnt_off00014190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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