Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69507586bf57931…

MALICIOUS

PDF

78.1 KB Created: 2021-08-20 07:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa3eff4635dbbd2dbe747c384362a8af SHA-1: 699de9aaaa30d66df41c28a3ff9c2b5c0471ff83 SHA-256: a69507586bf57931ad3dc09f3891acdae9a9e216fa82e6a2ac26b6ed540c2bbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the links and the detection indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nuraski.pl/wsg/userfiles/26031476252.pdf In PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/46051929213.pdfIn PDF document text
    • http://dso-fuzine.si/docs/mutexuxanovesisel.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/safadololanuwatebugebi.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/rinakonejonas.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b4d168efe---tufezuzubebupuda.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a46382a971f---kifekax.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/71924358952.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/regofuwemababiwupufe.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/34011185402.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/558762336.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071025178dcb---67866082607.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16240895155729.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/tipom.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/88101752848.pdfIn PDF document text
    • http://donationwebsites.com/clients/6/68/68901b9e08e997a22fc64c74502b39ca/File/18297779459.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/gobexegero.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a01601d2dac---wukonupokirubupufu.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/25199922499.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a098eaa4df5---gosamiteduxapa.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/52800244435.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/58429918548.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51b5cb3990---susevolalegipogamibe.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/39404161905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=naming+molecular+compounds+chem+worksheet+9-2+answer+keyPDF 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://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_off0000cd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE565 11652 bytes
SHA-256: 5352713415f938fa8d614b418c6e07fa988be5847b99c73a757b195fa3bd7cfc
font_02_sfnt_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 16176 bytes
SHA-256: 526cd5d44ea65127860acdfa693b86d7d1ee9176e6ecef0d416f59204315a790