Malicious PDF — malware analysis report

Static analysis result for SHA-256 6168874517775bb1…

MALICIOUS

PDF

87.6 KB Created: 2021-07-31 07:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a4617905e1ed557754376686b2a996c SHA-1: 782c68ad243cc8b042f327d15024bfa78319ff3b SHA-256: 6168874517775bb153128675f85f65d13179fd921a0fc0fa9bb0c7ea67b4a36b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/buvowotujiburis.pdf In PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608816068a3c4---95833970180.pdfIn PDF document text
    • https://digireg.se/upload/lazan.pdfIn PDF document text
    • http://flirdining.com/uploads/files/jefodinesuvanovukozi.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/rifumugoreduv.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/53202167067.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b81e325c5---36689282647.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/waxokugixezogabomi.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9355e3125---mewomigidadofedajufefuda.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ec83458a---fororeza.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/zevifod.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/81114692791.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/meponixonege.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/4332ef7c3741eab50c45420e4a9aea78/51397383456.pdfIn PDF document text
    • https://aaaxxion.info/images/file/siwuzifoju.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758a220b2c8---93984991156.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da63da20b6---tijuwa.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/zedazebiserorutilige.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/bimozatezizunune.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/5836935739.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/zagono.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6040dd4aa7c49995bf5537d4585d5168/26405310172.pdfIn PDF document text
    • http://classofjoy.com/KK/userfiles/files/tejibazejusovojepamopu.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/36887347643.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/a8vb626gi11c4fk27l4mnu7s60/kizirufalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=salary+of+a+second+lieutenant+in+the+nigerian+armyPDF 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_off0000f1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 11212 bytes
SHA-256: d3358806d497ac247f9005666df32e0eb483c3679527a3969ac1176594e12352
font_01_sfnt_off00010b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9D 16384 bytes
SHA-256: 8ca05a707d4c6f117232442d788e66eb68aa6376522abaaa38e442925daf2886
font_02_sfnt_off00013630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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