Malicious PDF — malware analysis report

Static analysis result for SHA-256 bab128e8e5d20897…

MALICIOUS

PDF

73.3 KB Created: 2021-08-28 09:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2047fc8d6a42d6e37b8f139bce4c77ba SHA-1: 55299c6ec72911a5dc841ac374198cf45a139675 SHA-256: bab128e8e5d20897f574760dfdb5cb516d6af9e60d69fe76812022bef0d61428
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=how+to+change+layout+in+powerpoint+to+portrait PDF link annotation
    • http://meimagedance.tw/ufiles/files/fesugofamumilulamozeto.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/52868846612.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/br7aml20ajfgf43lom8k05frg7/39887401338.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63be71488f---zevosetugulerezigogovoz.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/gejatekakujejebekewe.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e5f263750---26030103728.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/30326162545.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/jenuvawafuzunimenona.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/jilozawo.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/40044814357.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/nixakuduzobanobijuvidized.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1fb68519d---84515880672.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/90836973471.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/pefudaguzure.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/sowizev.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/07/20210723075456.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/rasiludewapobogamarujifo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/g8rk4430bf2iqhlvqtjvja6ia4/34357879883.pdfIn PDF document text
    • http://sooclose.eu/upload/File/62872417113.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/30605222407.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd6c994469---farilidigurixuxafabope.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/kapobuves.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105fea9b5125---kupumizovajipivilowuwid.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d0db69c37305484f2dde4ace47fb7196/jepedijutaniguw.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_off0000bd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD43 15768 bytes
SHA-256: 27723bc26c8efd869a3e912fcee104cfc99bb49c8bce6efda4324ded1146aff8
font_01_sfnt_off0000e61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE33 10776 bytes
SHA-256: 5474061839f5b64531c57d72f092b541797792bc2304b812649d76ccfbfe499b