Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e9b06e63d34f3b5…

MALICIOUS

PDF

66.4 KB Created: 2021-09-19 05:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8e8afd176a7ecc0dfc4a002a09adb44 SHA-1: 784f84c24e3afd5afda71d19ae4c5f17cc5bdba4 SHA-256: 2e9b06e63d34f3b5fc684556b77322b5b8c294f0a8d0b34a4022fb77f2a0d309
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is identified as malicious by ClamAV and an ML classifier. It contains multiple embedded URLs, several of which point to potentially compromised or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically flags links to compromised WordPress upload storage, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7937

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://unityproductions.com/upload/files/85198817689.pdf In PDF document text
    • http://autosoftware.company/autoresponders_images/files/90718767501.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/jutipow.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/89975632584.pdfIn PDF document text
    • https://camelcarpet.org/d/files/zeliredugodu.pdfIn PDF document text
    • https://ocw.tw/uploads/files/reneboxogonisarawarivi.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/vasore.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/wulenebezejawarularejo.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/17282395571.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/34537868732.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/55310950187.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137632b135cb---38605683256.pdfIn PDF document text
    • http://budropol.de/Upload/file/90344518774.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/kikav.pdfIn PDF document text
    • http://fullx.net/files/gokopakiwufanexolam.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161468eeb10048---mononupazosorur.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/1536588372.pdfIn PDF document text
    • https://majubesar.info/contents/files/33606943422.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/919a6fea0c078ad503e27a855ff75825/zalogegi.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/segusutozafumim.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/xakuvud.pdfIn PDF document text
    • https://rajaunited.com/contents/files/zowawode.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/mevaxosakotapakituf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+get+a+moving+wallpaper+on+iphonePDF link annotation
    • 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_off0000b37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB94 10672 bytes
SHA-256: fc95eb3e60f1b0615ed6912b8582670fcacd9e2de338815f3ed73414a5f97562
font_02_sfnt_off0000e3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 15292 bytes
SHA-256: 9fe8371e1e6a291cd703362c8b1a3c62b8d8ffbb6982ab8c9ac49950631ad977