Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82e25fe6a4af610…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 11:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 666030cefaa1f92b1e856c0c80e3f980 SHA-1: d6e0af9dcb80654eaf453554380caf2e36509af9 SHA-256: f82e25fe6a4af610e4a42653401af5191b2f561a8e0f4759f2046be9a30bdb06
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=watch+discovery+of+witches+putlocker PDF link annotation
    • http://wellfoto.cz/pictures/files/1974845396.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/pugiwevijuwabakemeg.pdfIn PDF document text
    • http://ihdbd.org/upload/files/sesazemogusefolakikigara.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/31361340862.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/jaxafosizuwupipumesogugew.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/qd1v41tk2igun5qfv3slcu2sqp/47996889182.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcdaf52a35---forajizajoni.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/bezejorel.pdfIn PDF document text
    • http://coachhouse.info/assets/file/mural.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/82599757333d77f668ce9e44c6d9720b/sitimukiputupuxelaba.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///37979308232.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/teleremuku.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/88968628559.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/40043415331.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/30309290246.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/sedovamusuxane.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/gigilapilo.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/60574383552.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16317558676946.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/sojizilibesegiva.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/31832153901.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/24103605078.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/sipapilajuzedorabepu.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_off0000d661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 18552 bytes
SHA-256: 9d5c5e9cb218d3b72e75f49a951735e8a145536bfbcece1c43c9da5e78c5c6fb
font_02_sfnt_off00011e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E79 11064 bytes
SHA-256: b2d40ae14783f96b846bfcfe55bf1b21ade4171d4a2f3ecc41d464445e479692

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