Malicious PDF — malware analysis report

Static analysis result for SHA-256 b317dc7a10f4b4cf…

MALICIOUS

PDF

77.3 KB Created: 2021-09-04 11:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b696e1cee1b88c6c85a557b64f52a38 SHA-1: 6cf18032d2513e121f29c673c1c8853967430767 SHA-256: b317dc7a10f4b4cff453b0fd2641c379f28764067aba77b626700f6c1f659df6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://thefertilizerequipment.com/d/files/xosivajudewezanoro.pdf In PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/nljetpdh6plmg25he3ips9ncmi/jizoxuzojetimavavevawara.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1642ee9f28---95777889551.pdfIn PDF document text
    • https://andrejc.si/files/file/50814897579.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/rizitozuriwe.pdfIn PDF document text
    • http://hodori247.com/uploads/files/nuxoliva.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4f5f53ab7---85947037756.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611addadb8308---17443949371.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/64155020206.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e692e8d32---xufujesefewun.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/cd971e32a0afdcdd5e0ff82edbfacb84/rifopojokivafuwumavi.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/643jk8d1a2e23b5frmlmhcuof2/20713895061.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/22718051140.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/vakizuxetixej.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d00214d1b8a---25508971542.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/warekoz.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/4618031966.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/3de5003c523743cf6fa801a5efc61ffb/86662843859.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/lewirudalun.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/64676687369.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/43913478065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=four+times+table+worksheet+ks1PDF 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_off0000ca98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA98 10716 bytes
SHA-256: 5a86cf5ddb3140c03b996e3826844465673c993c137639c3f94bab36094288c4
font_01_sfnt_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 17488 bytes
SHA-256: d7b9f59723744f57431062126c16b1753bf65f774eae517a30cbf3764f47c7b7
font_02_sfnt_off00011038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.