Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f80cfd18250743…

MALICIOUS

PDF

81.9 KB Created: 2021-09-24 09:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c279f2a3a28670f41c011536eb2172a2 SHA-1: 1621ed40b32165948faa1dbe97fee938c4ad0ea1 SHA-256: a0f80cfd18250743a4f90da869c7a4dd78c493e8023bbf5df62e5b3c9719b3a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to distribute phishing content or malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://nomylo.ru/uplcv?utm_term=ppsspp+games+under+50mb PDF link annotation
    • http://slmj8.com/data/userfiles/files/72254536497.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/jelunefelakimemu.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/96653394342.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/57168795311.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5bd5e8607---77408423001.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/bbba30596fe93991f1cac2cfe2ce0575/kamosuwabozisulajaso.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/73872260730.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/51683843076.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/kikatukajaxigurulebawip.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/79438215631.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///34342209618.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/35624261934.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/25506937406.pdfIn PDF document text
    • http://nscenter.cn/upload/files/zolajewemoxikeg.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/jagunodobodiredal.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210913002114.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/rakamitobadomudotikawipiv.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/mekiwejolaputemap.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/65397565735.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/fugutokajuba.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/46714329737.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fac1e0f2e0---24366672564.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/69125299723.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4n21ikiorv23n6e0d7mgam65cs/xosiwased.pdfIn PDF document text
    • http://boldogelet.hu/media/96452092202.pdfIn PDF document text
    • 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_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 17716 bytes
SHA-256: d1c5f1a8b32d78e0d133e73ad4f9cebef6290e6f285c62f5b9460c4a0b8811ad
font_01_sfnt_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 10876 bytes
SHA-256: 0e94efa3ad8f4be2f304ff923aeb19e523a23d19fc15614a13169d8a23547611
font_02_sfnt_off000121be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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