Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54f82453c7474b3…

MALICIOUS

PDF

93.4 KB Created: 2021-08-03 22:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1143808c1f61768c661030947d875643 SHA-1: dd07d3a3501f3dbf9b6a56e7d7ddf49eee54c383 SHA-256: f54f82453c7474b3bca8d53cf1f150072989f59da300144224bb8cf26030dbef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, specifically WordPress installations, which host PDF files. This suggests a phishing or malware distribution campaign where the PDF acts as a lure or a redirector to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c03a9408a---31383705367.pdf In PDF document text
    • http://fluellentrees.com/clients/58222/File/gelidejofas.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/ed8eb239b05001fd17126aa72819d6ea/galajisatigutosuwovez.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/14663828838.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/fd7vte4vrithve3nuqn6nvi416/93897950617.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210720/file/1626718541.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5e1ae224---33659146569.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/10ajrssj3svhkdjth6dk9a9ni3/63364140194.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/senoso.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/5012029562.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b59d175e8---30994677020.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/43441793025.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/34711297457.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/xanofoleka.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/kcnb1fgs59aiaqp2s2d6l108oq/sudobeketazozekade.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/warofaretegasezinoxeku.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/tojiguloba.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8aa3b958f---bazinazubewuti.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/24942825044.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607d94763c7c1---4641813038.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/27258109564.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/jorev.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/090a3fece641234b1917d0c70e61a3fe/rakejawedupedumepivufato.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/diwiladabozus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=livre+physique+chimie+terminale+s+hachette+correctionPDF link annotation
    • 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_off00010006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10006 20672 bytes
SHA-256: a08d631d8e5e699e51928206c91aea219477cb832122b865a035c3d0b481e10c
font_01_sfnt_off0001344e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344E 11024 bytes
SHA-256: aecae8776fe0cd932fdcd4a71bcd25fbfecbe34483960f0f986e1145cf09eaf9
font_02_sfnt_off00014dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1