Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cda4cbbafc92a68…

MALICIOUS

PDF

111.2 KB Created: 2021-08-14 16:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1833d5f6771c72e737e181c458f01f9 SHA-1: 1144badf2f29613e4dab4e59a7ee6b3f31c49fe6 SHA-256: 1cda4cbbafc92a68b6f0698f85b6df595043bd312842304e394390a3498af713
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, likely intended to lead users to phishing or malware distribution pages. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://beytarimcilik.com/admin/editor_resim/file/koveteruzowakaze.pdf In PDF document text
    • https://henklinders.nl/henklinders/upload/files/95946598382.pdfIn PDF document text
    • http://www.seja.lv/assets/ckfinder/core/connector/php/uploads/files/fojipegepazam.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/batajumevazomubavabet.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094748c28a94---5968100251.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/59911757707.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/daa326d2d9f9edeaec81447fecc6a01a/wepimakobapuwuweb.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089566d022f8---14071992278.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/e3cbaf1a12a6b00c3c88ae95176de98b/lukurobalugog.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/wuludib.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210620120536_39u87z.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/tirurikalodimoza.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/250c8c4db70b9896bb5235bdd7ac6419/nolodivakidiniwuladepijin.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3ba2d8c59---rifisiwogosi.pdfIn PDF document text
    • http://izdo.org/img/userfiles/files/5051487466.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/xajasimipuwopisomusofebut.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a1ea5ce02---zubagez.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/zoturopesoferofo.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/vewobelupi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608038463429a---84237982024.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/fe95433779d9e083e6a78a9078c75faa/66447121730.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/53913342138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=el+lenguaje+del+cuerpo+alexander+lowen+descargarPDF 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_off00014c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6E 10900 bytes
SHA-256: 0d488e3af1139d51bf43d5fdf654c84a08ac677ccb3c5135311ab80c5d70e4ee
font_01_sfnt_off000165a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DB6 18584 bytes
SHA-256: 859dd8eab5843df931b02764715df9c55a6397f067de5f99d2e1d11efa9af8c2

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