Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc43106759c2c1d1…

MALICIOUS

PDF

90.3 KB Created: 2021-07-22 18:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f22754751dfb90b2f6dc6251922b25a7 SHA-1: 2d01ccf5e71d541c6f5609657e341a9281606657 SHA-256: fc43106759c2c1d18f67ef29292e4330feec1ff3a24e189e84922328b40295ee
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content. The presence of numerous unknown URLs hosted on various domains indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdb65ab83d---81887627167.pdf In PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c157f662157---88369540646.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16092c7ca7b31d---92884625628.pdfIn PDF document text
    • http://beiks.info/public/file/37777425295.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/75753314954.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b6ee9f5d0c0a4be8c29c4ac47bd7a1e2/4976073426.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///43702320389.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073d972d30de---wipizidulirugazul.pdfIn PDF document text
    • http://grabnerestriche.at/vumot.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/32ee9688b60b85cd7f5f80c66929de6b/ligisazaponetiwasonuze.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/vutudafe.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1926e2c96---sirun.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/ca907b4218355342d64652fc84543ee2/64717555822.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/20597342709.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/mrf0u00qadiuh9fq3ip7htrb4p/jimavejurerug.pdfIn PDF document text
    • http://ledson.ru/upload_picture/muwaz.pdfIn PDF document text
    • http://abnicum.ru/files/file/laleku.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/14ca5413cd7bee0032af832492916edb/zavawirazawowezanepuveja.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/silud.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/3063550968.pdfIn PDF document text
    • https://p87.hu/files/kolotegepefujatutilugis.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3ec985b4f1b66362ec260b07a38dbd4c/koninizuba.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746dc5ae6aa---vagaxemirifabesamamidi.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd282b8c62e---70854098227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=a7x+seize+the+day+mp3+download+songPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 2956 bytes
SHA-256: 69c467742762c8167c06084a6f81caf0868c475e8ad5d265487588f36e505363
font_01_sfnt_off0000fc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11483 11304 bytes
SHA-256: e5c9db63f4d7358ae40466c55bb23aa69a80e89352cee1a240f8a2f65029435f
font_03_sfnt_off00012ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE0 16948 bytes
SHA-256: 6c693c85ffe60af38bb0372f9a58eec95e7c3d16a989b08bed105dcf69e8c01b

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