Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5025cb97d64777…

MALICIOUS

PDF

79.4 KB Created: 2021-09-20 19:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e9e1fdb397c747f6a1eb2c520d168fb1 SHA-1: 838e15d857729ab1d61718a970c6bc79c6859140 SHA-256: 9c5025cb97d647779a3a60373f20b1b871c0a267a2534f86c74c4a68ebc7462d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs pointing to compromised or disposable hosting sites, likely intended to lure users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cuichi177.com/uploads/files/202109131019153121.pdf In PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144aaac4cbbd---sozefalufurepafivanuzize.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/12898705491.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161446d0fdea24---vobevitogiberevez.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a64266e71c---bepuludalefadixogiwiko.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210911_422288D42DAF3C4A.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/vurabotadatogasukitepi.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210917_045552.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7995887032.pdfIn PDF document text
    • http://cold.lt/userfiles/file/pakokusoraseved.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/fipakotanokasejulajin.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dexedumexudawinozep.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/fodeboxopapobuko.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/zimobizaginova.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/43926161485.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f81e6e4dd---84522003197.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/75099831856.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/49445266917.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/97727396425.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6c0a836d6bb5553bedbe87781501018e/fujazofitezunakerenagiri.pdfIn PDF document text
    • http://symbolfoods.com/files/file///91103726850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=rpg+estilo+zelda+para+androidPDF 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_off0000d407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 17168 bytes
SHA-256: d76566a7aadd52eb259120e3bef3d8ea0089f258eb0f146f929703224c5e3472
font_02_sfnt_off00011817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 10672 bytes
SHA-256: ad1012a69487de5d35da6139d066ede2b177be6efdb21c49fe4d9186090f74f7