Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b08d92b60c0def7…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 01:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3322f3cb189cf3a283b757ffebe0150 SHA-1: 0cffa765e8ed58e67ba5e5b560e02bedf4be33b0 SHA-256: 3b08d92b60c0def7df9008f0a675f4ad7d1b5a89321d0fca16ccb49eb54a4e64
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous embedded URLs, many pointing to PDF files, suggests an attempt to manipulate search engine rankings or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://controlsystemco.com/cache/fck_files/file/39268681687.pdf In PDF document text
    • http://e-junghan.com/userData/board/file/fizegupegelibikexuwituz.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/23047072845.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/sedunigijofaw.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/betonaruwotuf.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/20120333899.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210908_979E2714E6558DDE.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210901_161559.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210903_082504.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/nejup.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd1648bc2d---79818466323.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/67ff8dc3186f01418cd21e886109c19b/32454440338.pdfIn PDF document text
    • http://jonme.net/ckupload/files/fojerusaxegebi.pdfIn PDF document text
    • http://halanmilk.com/upload/files/79136054595.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/wikanetobadi.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/gutap.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/94196268015.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/luvepojup.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/41522747601.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136d34dbc767---pinenexotog.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363d230abe7---sovafokugukizirav.pdfIn PDF document text
    • http://salkim.com/userfiles/file/rukutuviterawunudofi.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/bugomopatalov.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/jarezafifobavoj.pdfIn PDF document text
    • https://atrax.hr/files/bemaxis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+box+black+screenPDF 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_off0000d4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 10580 bytes
SHA-256: 55d5bd2ae4cfbe7d5e3315e065970440f2e4e07d16cf584ceaecdeedce8c21ec
font_02_sfnt_off00010507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 17064 bytes
SHA-256: 0b77cf13fe87a990d4bcb3f86308e581f3fcae725279ababa1b38865e9f3dc14