Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b729cbc7ff5bf20…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 21:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: aaf6b3b7f6cefcd122b188a8bfd047b5 SHA-1: d6d583ef13dca796a7d72d74449012d0d2ff1849 SHA-256: 7b729cbc7ff5bf20a3de91fa1055ce9945b257650bef4ff43775028fb3753ff3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript further supports its malicious intent, likely for obfuscation or to facilitate the redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://smidgel.ru/uplcv?utm_term=1869+candy+crush+saga PDF link annotation
    • https://shop-ecobati.com/medias/upload/files/sezoposi.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/99328093520.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/23909206882.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/95015273791.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9041b9fa6---jilesuneb.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613157795b556---kituvejejusujepolaxu.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/nikun.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/ferew.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/91021357328.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d171ed7c60---41481867780.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/72911260840.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/povuriminixogujizumapik.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091417114569.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210913024925885.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/rokeropobexobilagemeba.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/loxexozenobunipigakuka.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/bakifadujol.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/72480828984.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/batagirovokudoparo.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382d61abfbc---75114022333.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/82838202334.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/zepulud.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/3299902486.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/63203134309.pdfIn PDF document text
    • https://tarsiman.ee/files/file/69746772856.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/68887145079.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_off0000dec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D9 19228 bytes
SHA-256: f21535785330100fcd63e39e3521284a342723f8c272fcd52ff48c62282b46c3
font_02_sfnt_off000128fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FE 10876 bytes
SHA-256: bfdc32137d6a05da059873a4363bd4007af8052c88a947495a52de10006371b7

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