Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e46376db45bb6c…

MALICIOUS

PDF

80.4 KB Created: 2021-07-28 07:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 304d74fa643fd843f0b4f1b3c73e882a SHA-1: 9321619481ee92a54d3605e5e41957ab51ece7db SHA-256: c4e46376db45bb6c6495dc56512652a78843b871a375dc4b8eb8734d9aeb1b51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and embedded URLs are indicative of a campaign aiming to redirect users to malicious sites, potentially for SEO poisoning or to host phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cukierniabrzezinski.pl/www/artizam/fck/file/45064682128.pdf In PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7bcb40e78---fiwoviwajafiwo.pdfIn PDF document text
    • https://rinducm1.com/contents//files/6215681951.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b1e81ea5e4351959168a6a8221692b3c/pirelupedi.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/49751835187.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/85qvm1u994rcfnc8f0p3mis3vk/31822537680.pdfIn PDF document text
    • http://sam-global.info/files/file/maliraribunutazowisefere.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c4b0e935---52231971436.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/78718719407.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/95540962751.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b050b61140---berefir.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/98937338888.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/kfgornfgvsenj83p2sbith2dck/88811744811.pdfIn PDF document text
    • http://bakoca.hu/files/file/jolutesajamavatosavonaxel.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/fumofokisorojejupum.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/67566943012.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/fobofumijugumosunijodunel.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/juved.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/5d061726fff3e1f7e6d57c87cc1a2703/76343012303.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c22b8496ec---27420482311.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16088f98d86836---fureworewejeliwix.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/13726132287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=belvedere+vodka+nutrition+informationPDF 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_off0000d601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD601 10656 bytes
SHA-256: 12c07894160daf3a696e788ed77dd932e4d0a38d3ec4b93c5c65e8b6b3b07cc1
font_01_sfnt_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001067a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067A 17308 bytes
SHA-256: aa2c63a72c66a5786ae78addee1865e761a72abc6ffa0528466858a552ad12f4

Open this report in the interactive analyzer, or submit your own file for analysis.