Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1f85c567f53984…

MALICIOUS

PDF

94.5 KB Created: 2021-09-18 17:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e03eec625d862028ce5582d616c7ef07 SHA-1: 14a390d12f957842ac225bb41da836bff800cb5e SHA-256: 9f1f85c567f539846069ac1ef243fbdac9efbea01d335bb44197288dd7a0c455
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 high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to disposable hosting and compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' parameters in some URLs further supports the idea of a campaign designed to lure users to specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://infrive.ru/uplcv?utm_term=legend+of+zelda+master+quest+rom PDF link annotation
    • https://domilot.com/uploader/files/tugotuxasugigura.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/zapotomorulakewa.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/xunitovulisod.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/90616114120.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/gokumavifesaxoguruka.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/77276716624.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/79340003993.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///12587471849.pdfIn PDF document text
    • http://hanleyresources.com/images/63737073492.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/gopesuxutidabiwexenex.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/safunavazejozukirevenetaz.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/75471676984.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/5ss7a3ourpteevpme6nnlkj1d7/31002428739.pdfIn PDF document text
    • http://livestocktool.com/d/files/42227418175.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/33712745971.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/pevisaz.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/3d98e60b773dcb5e387bed698e6d0348/50801438046.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091404360973499.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/27207711193.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/jolera.pdfIn PDF document text
    • https://produse-zilan.ro/files/tenarozixo.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/patijasupipopimepe.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/buwipedopewitibeduvusu.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce22f057f6---womizinebaxopisigipepazof.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_off00010cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 17824 bytes
SHA-256: aa9718f3bf16177e50426673ac9f669d3d5a590bfcf7326fa7b96c75b694e816
font_01_sfnt_off00013b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4F 10868 bytes
SHA-256: 2447870be2bfb49228a9cccb11f6e7fb3a269f9ebeac8de432147c0efdee6739
font_02_sfnt_off000153f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1