Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f287727834efcc…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 00:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d016f15d993199ae025197f34bc5459 SHA-1: f0bc446d65440a0d5c7e4d194e61471e794f641e SHA-256: 24f287727834efccc95ebf130c11e6f075d15cd6c52e5dbe4c49e8434ceaa032
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it functions as a link farm, pointing to multiple compromised websites, including one hosted on a compromised WordPress upload storage. The PDF itself contains obfuscated data rather than readable content, suggesting it's designed to exploit vulnerabilities or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://imaginove.eu/data/Files/rajusisezidev.pdf In PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/radasilapitawopixaju.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/wuvevujukosobafavopelinex.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d23a6da11---73304958645.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f59d692048a---temikixetujebesonevasi.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/79c99ce8d9f939f9bf2807785e71cd1e/bupixomipenoxu.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/bopesemefot.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a7eb23888---posewadixelu.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9f219376319df920f554b3993d414785/mosakonozuloguxoputopajik.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/barubuxonevesazozalimuxom.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/b4jpbbonmc23ik5danerlo7a41/32423079925.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/03ad8cd9aa29f70311a87a093d2c8204/27997955388.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7d3984abe---75459047486.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/finofuwadukotop.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/wujal.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/85170368264.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161126f2a87b7b---nazofowukewagizobomus.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/monipa.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/15548632015.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9b5613601---21696198016.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/75f2c48bf92f8ed5b70d517418a1df0c/majatuwelenejut.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/54584705297.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/96716061675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=country+of+origin+effect+pdfPDF 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_off0000d644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD644 10664 bytes
SHA-256: 27d73ef31b1d635516a466be017a327499296fd5db1808ce588692456a07c217
font_01_sfnt_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 17652 bytes
SHA-256: c3ac61dde2430a791eeead3afeb6608fc3fa4570d5ea1bfca2e2953abfce2e1e
font_02_sfnt_off00011ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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