Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74e50d711848463…

MALICIOUS

PDF

93.4 KB Created: 2021-07-14 09:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6befcf2fd042475c7bba99c35650d658 SHA-1: 94be62993ab41efee97dc16fa5c1f7749179a1a8 SHA-256: a74e50d7118484634bbcc8683711d8ed18120e683f122ea85bc0e450f3ce454b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://ketchas.ru/uplcv?utm_term=8+ball+pool+indirect+guideline+apk+download PDF link annotation
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/sudarajeberuwewesunitesu.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///wedabek.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/74163518605.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/disl0t9v17ob7kfgk5lhcf4ik6/difedoje.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/52c1c62107eabc57fbb81781215f4311/jajupomugaroxe.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/66b4e3cb0945ae7484f9782bfcedc219/76355152214.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/jegegomivefikewonijiz.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/fomawiruvusolipomuvaj.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741637b473b---nizofalezaxiwubila.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/llrgmn62m66u32suho3nh8q8k1/84412795217.pdfIn PDF document text
    • http://charontrade.hu/data/file/51321466655.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608687b10df26---nusep.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16091d78fb65b7---90712098888.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/dized.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/kipomuxenukuriwaja.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/35788194317.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/nigidomivewipebasi.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/1a4cc47a77bee54efe13ed83843aed81/semesirofixotawu.pdfIn PDF document text
    • http://www.toptehnik.si/images/95246348459.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/9a62449cd9804ba1fd62e095ffb02e3c/55452438793.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42F 29168 bytes
SHA-256: de691e6c09d4ee7434b4bcf99211af61a2f929638d5f5c461043c9828b8cf671
font_01_sfnt_off00011f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F37 11048 bytes
SHA-256: 6241d85eabefa66b257cef85520694be3296dd068e04c3736b53871ca1be3752
font_02_sfnt_off000138a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A3 16516 bytes
SHA-256: bb2d99f329d47e050701f4efde64dbd42691d5c9e7c6492c8a11dbdcdd5922c8
font_03_sfnt_off00014f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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