Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f840d7152b7387…

MALICIOUS

PDF

86.4 KB Created: 2021-10-05 20:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e9227371a7b54af8786367b43812c79 SHA-1: 8a10c9dd868d88d5f01e0e16e11df1e57cf9f926 SHA-256: d6f840d7152b7387e49ad4db5c73028c857da33d9510c94177c50f29771f7093
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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 https://irlanc.ru/uplcv?utm_term=mastering+bds+2nd+year+pdf PDF link annotation
    • http://wyadonline.com/userfiles/file/32693632190.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/36924618313.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/jejitofazanafafitojub.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/60191229837.pdfIn PDF document text
    • http://recrute.fr/files/files/75674702064.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210912_28AEF27BA934A9BC.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/jibije.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/jedowezepam.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c43cbfb68bbcdb16af500666a20c9b79/nefobowaxuvazefivugiwim.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/45337139997.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139c09f4dc9a---rogawowup.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/nerovemana.pdfIn PDF document text
    • http://ukrfirework.com/images/file/46296869531.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349b6423984---kaxoripekafixamokujowis.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/32714844357.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/soxegebatewugujifi.pdfIn PDF document text
    • http://hnht-electromagnet.com/d/files/43149027686.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/34062521280.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/mobutavabofewosiv.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/19467964541.pdfIn PDF document text
    • http://samtekelektrik.com/files/xokerejejivabomaranaduti.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/mozoresumuwoxaxosi.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/tuwomojidotopibobono.pdfIn PDF document text
    • https://baongochoa.com/upload/file/nebavi.pdfIn PDF document text
    • http://hnhappiness.com/d/files/1759411131.pdfIn PDF document text
    • http://julianina.dk/upload/file/14381182347.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_off0000d130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 17720 bytes
SHA-256: fbd8f7d7de8b3361a0e00968bead3f5af107ed2a890868303957c78eaf9a51c5
font_02_sfnt_off000116ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EF 18064 bytes
SHA-256: 39122796a0f1469d569c1d234a8f6ad34dbfb1c93721e9acfcd51e002b836c17
font_03_sfnt_off00013290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13290 10872 bytes
SHA-256: ac69c9f2a6a5e6ad3d561d0004799eb0b3d7aa17597aee14f9a0994de4183577

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