Malicious PDF — malware analysis report

Static analysis result for SHA-256 45cfe6ee2da3bba8…

MALICIOUS

PDF

86.8 KB Created: 2021-09-02 13:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 612dded7c37044a294391f4076d68447 SHA-1: 138764a238e72255b9c314e9aaa2060dbde3d3bc SHA-256: 45cfe6ee2da3bba8f4f3dc990c8e5fabcb2c8f166d23847ddc43ea6ac8296e29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The file contains a link farm pointing to compromised WordPress upload directories and disposable hosting domains, suggesting an attempt to redirect users to malicious content. The presence of numerous embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a strategy to obscure the ultimate destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://whiteplacard.com/UserFiles/file/64114176692.pdf In PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/dmdke94fk6o16eg67pp34em7mc/48623785772.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/ffd16d9835cfde095ea937a79cf0ec39/fowezawok.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160743e2b2a3e7---44404401560.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/xunofebunuluparifox.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/gelisavokenoxuxafe.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210615_273A0EE25B1E846A.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/25209823941.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742be62df35---99577997068.pdfIn PDF document text
    • http://sakem.org/userfiles/files/fakome.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/16928708175.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/kexegumuborunokomile.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/2u3bmmcnof1ekqa3jlj94iu3q2/jizip.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/fikejetapexewanafazak.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2927f1862---gipezekuvune.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/sd290p9b48viterrcmkqjg9648/51516959348.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160904496bdc43---xejarovodogaloxa.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/d10464007d7b1fe53ad2beb819532806/zukadozas.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05d6e9e88d---tezelubarifiz.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/96224841432.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/zutowifaga.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608048f116da3---17880702550.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea131880a2---zoruvo.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/funawewim.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a242860677---duvusivivogivodubaka.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b31d4d65644---kovasizowusuwid.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a3575b1e67b9abc6d61b89334fb43b1/64973507819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=maahmaahyo+english+to+somali+pdfPDF 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_off0000e81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81F 20068 bytes
SHA-256: 241822b2e33611c8aebe8686e04c1bd6c2577efa26accce10337e4641c2181c8
font_01_sfnt_off00011c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001344e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344E 10952 bytes
SHA-256: e9751f777ee4d571af98d5b5623e63f49cfc4159e7f05e761ac6615a902ef97b