Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd8553f3fa715f9…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 09:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4ba81f5c3135ddeeb194223c9a7be8fa SHA-1: c208e28b6d1c70582ed0e0c79def3d999755f5d6 SHA-256: acd8553f3fa715f96bc368210fb1248562b63b855853fad8eec0d3b3dad3dbfc
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://huntic.ru/uplcv?utm_term=phone+not+reacting+to+touch PDF link annotation
    • http://vanguardhungary.hu/userfiles/file/boripebo.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/53953443503.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/43412768732.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/5362835263.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/torabifurosezazovumopaji.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/62017583117.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/25920652237.pdfIn PDF document text
    • https://blokhol.com/upload/files/biguradowuduxufijif.pdfIn PDF document text
    • https://adikketiga.com/contents/files/13128901431.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/pezazutegebarude.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/34898229503.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/fijugu.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/17783284579.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/29839455021.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/m86ihfgmd5cpmqrkot3nis8bnq/zizigofivaz.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/fivuwizenunidel.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cf9a06d2e---zuzopuraf.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f43f87d23---vejigumubumadigufu.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/gifizixezebezevavegute.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/65209953842.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/58260110538.pdfIn PDF document text
    • http://geose.ru/userfiles/file/gizuraseriwewijolavu.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/ninowebobenoxevojulokuro.pdfIn PDF document text
    • https://lesura.net/userfiles/file/wulilenabe.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/sawopuxezuvo.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/97021529800.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_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 18564 bytes
SHA-256: d418598422082b715e3c2eee60e7050b4661abd73ecfa600f0ae85091b7a8b7e
font_01_sfnt_off00010e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E88 10396 bytes
SHA-256: ae973075817c773db5ab7ef6e4e132a46d339636deb59dd3f95e1bf00d750f3d
font_02_sfnt_off00012605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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