Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c7cc37c68616fa…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 17:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3a672989101079828489894838ca2ef8 SHA-1: cb52454cbace03b3c4c11b39e004825f7381e1a6 SHA-256: 12c7cc37c68616fa3b7d007c82ae1883c15d21366d023a609d427d2af1ede0aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URI and link farm heuristics further supports this, suggesting the PDF's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://chcial.ru/uplcv?utm_term=wonder+woman+1984+live+stream PDF link annotation
    • https://wisestudentz.com/userfiles/file/gopofagivukiv.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/65954338864.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/dizipidof.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/serasevivuxojezoxegavo.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/sosotititenufutewukodon.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/55606651291.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/48040898967.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210917120509.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/a2a964ce48b3f2623e6f3052d12b2c37/28376955471.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/79759987820.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/vexovuboranevezakivaravos.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/loliwuweruvudapanesas.pdfIn PDF document text
    • http://potlista.com/file/files/50111359656.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0d6816c5d---xosedamotivijizuge.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/juzelejolekagaziposekiz.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021091222254370554.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/zexotorirokopuxamemosupub.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/velizejezujadilapugon.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/47153095217.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/7afa7b562f7c260891cbd083b2e0f0f0/wekijub.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161325b0797b16---disumumazuniporap.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/nomujijapovovepagezeziz.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/gademagagumavipoguzufagun.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/luzula.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/14054398549.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/52688626149.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/92081342324.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_off0000e1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 11060 bytes
SHA-256: e44b50142162fad9f972f53521b82c4c61804512d90b79a2ec5fa3925d1a76e8
font_02_sfnt_off000113b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B5 17476 bytes
SHA-256: 96f1d61ee1d57b4b87212301577843af6f960cebc3388014c5d756edf81fc139