Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d9adc56057a266…

MALICIOUS

PDF

76.4 KB Created: 2021-08-28 03:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5df7c3fc4509ed5863b30129bb9dfa80 SHA-1: d759f003c318acbeae8c989586bd6490b4536114 SHA-256: d1d9adc56057a26656bcd13bc482d0c4dee3ae230eb1338bdf5f4f200e00833c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of these links suggests the PDF is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://chcial.ru/uplcv?utm_term=freedom%27s+daughters+pdf PDF link annotation
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/xixunizapite.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/rasezutexigewujegi.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/vujimiwu.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/majikoxujugafazav.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/tidaj.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/58n421ul7di78jiav6iermdhfh/fodofogebo.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210820_042819.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/131d5ffb065da7a6a5cd1223c21636b6/47944378003.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2416efcc0---dawisedowaso.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9980480cbc94e58c61b77aa3ce3beb15/pupobiseve.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/muberusufo.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b9f8d9914---44877923975.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f39af177e10---lojozodubozogofun.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ulvs4telnllijj46kv892j8sj1/44386065868.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ldkavin234mibpalh3bhih2du3/degaxovumosepumugimorig.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb14417481---26936411298.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a788d248659---natejuz.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9e5987a8f---dibamebitona.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/xanobije.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bf91770c8a7---42369485061.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/2106181060.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/lajukesanexakasemuzus.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_off0000c81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 10812 bytes
SHA-256: b317ed8979047fcbe08fbeaf58f2fff8277aa07de804fc3f8378faff392d8501
font_02_sfnt_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 16512 bytes
SHA-256: 90162cbe61fb8db0525383780ca2798c8efb7f2ba1fc8d94c83915894963e44e

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