Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f53e4de0376a218…

MALICIOUS

PDF

73.4 KB Created: 2021-09-03 03:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 701f64971f96e37394cb3a397f06f460 SHA-1: 1805ff2be8fe12ec924ab31e04103afd88c4fa6d SHA-256: 9f53e4de0376a218cf1e0f58aabcf7cfff9153fcce0ca259085f7b30a5a6da7c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://yomamasushitogo.com/uploads/files/xoduresubo.pdf In PDF document text
    • https://alev.az/userfiles/file/bizoloworonojetovix.pdfIn PDF document text
    • http://agilesolutions.in/uploads/pudojowetorolubopatag.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/tidajezobusiwi.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ff2bc3757---64186749363.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///88633162824.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160901a6df0fbb---83880815893.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b633b6622f6---totigojakujaximulatunadi.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/14157473773.pdfIn PDF document text
    • https://partnermind.cz/images/files/bodonosuk.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/92029283717.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/9d45ec0c838d4b7f03a24e1e2706f6f1/jejugokanogazi.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/xenenupapalufufur.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/iihmvqhh2v5o4bg3ipdk01e2e2/11256517016.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c8920d125a8---62440214586.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/553816617.pdfIn PDF document text
    • https://masukpt1.com/contents//files/kiteruwigamowaleg.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/tirapalegoxarog.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/5585851193.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/54029154474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=online+convert+pdf+to+ppt+formatPDF link annotation
    • https://easyown.ddproperty.com/datas/files/63726979476.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_off0000bc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1C 16796 bytes
SHA-256: 2a00be6758d1b97d2d9ca274f12f6843fbdd8b40c220079f388ee35dd5e4ed7e
font_01_sfnt_off0000e7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBC 10704 bytes
SHA-256: 64162de0d1587bb6b938f691d21abe98184e18e91863665476fd3897b34a584f