Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d50da1679e3290b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 16:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ff34e8335b9608eed4dca63a70497c30 SHA-1: 1ecda4cadb9ead3a5156c704abfa5736dc54bfc6 SHA-256: 0d50da1679e3290bf0cebd97cc18ba91b2f13d058d96e788a15078fac0c9981d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://krisoc.ru/uplcv?utm_term=printable+abc+tracing+worksheets+pdf PDF link annotation
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/31a6759439bc009444523c5ca596d893/6432558580.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a36ac8c22---79087433800.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16132604a8a17c---55878776642.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/81789837077.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/joxipedumepirerasuliv.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/vurabuwoke.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/53069862811.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/gizikoxiwujunebiwarar.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/tunababavuwesarefegodaso.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/36968390135.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/91258054077.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/xabepuxilobojinekibof.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/semunezetutaketemajenif.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/46820956197.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/71391046949.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/mevini.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/72605109100.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/9067960362.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/q2ginqchbpt17khneqo4nsea6l/zexekagekeguzenebej.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/vafonezopudulugudevu.pdfIn PDF document text
    • https://pecsikult.hu/files/file/34238232584.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/48061422608.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/25313313708.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360f462afb3---7312702878.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_off0000c491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA8 11216 bytes
SHA-256: c5401a007992abcdb1194657481f8d35b15bbdfedfa53c4c4c85899a2099b214
font_02_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 17156 bytes
SHA-256: 7f872aa5d40b1aed4abd1bf202e32b024bd54103cd802ab58792cdba21ae731b