Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6dcf051b524989…

MALICIOUS

PDF

75.5 KB Created: 2021-09-19 01:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9ce004608f16060fbcbdebce5808c5f7 SHA-1: f65d782f2960d0be494b92f2d8c4ad12ab6ff092 SHA-256: 4f6dcf051b52498952b3524a26d3afc564158ac6a127e8f0919335ceac6c4083
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO poisoning campaign. No scripts were extracted, but the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=panda+desiigner+song+download PDF link annotation
    • http://myshopgroup.com/userfiles/files/85156874318.pdfIn PDF document text
    • http://teknis.it/userfiles/files/48967427947.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/xamujanesusebubidezora.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/18329825017.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/naromadubizamodepubodiv.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/tikutadenu.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/21504077322.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tubigotokepotidave.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/jidewusisogobikuxi.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/63621915505.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/8292984359.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109181805499171.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/86238473749.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/lilarofofowixajulojeju.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c981e9a5d5---saginazinep.pdfIn PDF document text
    • http://kotolantopeni.cz/file/96037961458.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/xisepelup.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/bizukowifudejewodubi.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/92621363205.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/82420371431.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/jubowuvoraz.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/vituzekilorijoj.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f976a7788a---711045397.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425c6ebc2fd---tagenaweri.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/102171411.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_off0000c51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51E 16676 bytes
SHA-256: 128df4baacc8e77b58d945b90665056f2dfdc2db356a5835deb315da47703c42
font_01_sfnt_off0000f030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 10412 bytes
SHA-256: a37aad2321916ace937372322b463c6943b8cffdd053490ed50970799071fc93
font_02_sfnt_off000107b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1