Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc66aeadea4a9d79…

MALICIOUS

PDF

85.8 KB Created: 2021-09-07 19:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c495cb1e9ad142a7f580b4a4c59eac3e SHA-1: 747e6c5b33d75f5e7af9850e6b202243fd41bf32 SHA-256: fc66aeadea4a9d79687af76fb0b21e1b5bd9b603c2fe672d90629634814964a8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a likely attempt to direct users to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hoteldazegliotorino.com/userfiles/files/ragunewuruzoxuk.pdf In PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080135459340---dimefo.pdfIn PDF document text
    • https://adium.ru/userfiles/file/fasitovi.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/61867776575.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/88424387264.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/monijigexonojuvamimutera.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210525014240.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/1702149129.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/nilusinakuwuwivus.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/08/04/80568882978.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/xopimenexulidigazu.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/16922077258.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/54592543190.pdfIn PDF document text
    • https://fotovipvercelli.it/file/diwelu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pmi21gj9hsop4imtvjgfin0aa6/52716156234.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/34302718068.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/novkckmpjh5i0rj5p8mmg6kgv5/70839164493.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/78142696489.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/52089055917.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/3161412268.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/jokanugigenewo.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/1jr6v42dcvp0qb3q0q42f46dso/lojodojunazafajevebadowog.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/11344104422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=opening+the+akashic+records+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_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 17568 bytes
SHA-256: c1585421ddad7eb0b812b9be6a4dab68eab72440f53a725ef5b8dfe7b8f2d545
font_01_sfnt_off0001181f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181F 10972 bytes
SHA-256: 343d6b95fe8416b1080dc78e125289f5b33a640f69ba6dc9a792e07a54c7be71
font_02_sfnt_off00013168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1