Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6635db4365f4c4…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 06:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 979058acee7366036e57f4e00a648d0a SHA-1: 55c50032e1d28eeafb57332749707951429f66b7 SHA-256: da6635db4365f4c47866c6ad8a6cf8d6acda7ca8e8c6cd8215dc6760ff68a63a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous domains, many of which are associated with compromised WordPress uploads or disposable hosting, indicating a likely attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and appears to be non-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://paradisetourkorea.com/FileData/ckfinder/files/20210903_07C9CCB399D37325.pdf In PDF document text
    • http://mobil-tech.com/files/91823634113.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161363f65d0b8d---65251726307.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/4058421753.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/48608710865.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/25203235663.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161372059f2c6d---xobuwepobojojomibod.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/43862902842.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///gijuragaguwi.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/302a1b3237b015c3bb47afe99b8ed045/menezidupipag.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/samevoz.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6p7u6s598h2j3psf6i8au6rs57/guredijagugaret.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/zitilesogalubuwutof.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/51712379424.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/kuwozuki.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210915230933.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/sakemade.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/fepawux.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/jopupemowuvoketu.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348c7a91442---87821933965.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/92587741025.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/mononusarokuvagu.pdfIn PDF document text
    • https://www.servicespace.org/inc/ckfinder/userfiles/files/49474381773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ymail+android+appPDF 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_off0000e590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 10140 bytes
SHA-256: fe3f455e4e26ba30771306834505adb832768906ecc8d2f968bb6c3d677fc84e
font_02_sfnt_off00011411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11411 18056 bytes
SHA-256: 79223e5eb1198629d975ce522cd650a105decae7818cecee34ac809efe7fb7a6