Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e45bddeeb9da6f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 06:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0166aa9ab0379a6266ec95a506af8b69 SHA-1: f1d88872ac3142cf9f2fc42c27d6ed3f3d057a93 SHA-256: f8e45bddeeb9da6fef5f571d43ca11f5a955891f6c31a7c499ad1912375e12ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of external URI heuristics further supports the attack pattern of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/vqt0ncih3nbldhn5o3tik1u69b/27828034919.pdf In PDF document text
    • http://vksraja.in/fckeditor/upload/file/34476493725.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/92307705704.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/xuxuj.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/mijekupum.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/tolisarikipu.pdfIn PDF document text
    • https://hoalavender.net/upload/files/41542015752.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab59d6d95af---kufonurujutetapobita.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606da4068f646---tefalimuf.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/9a8ea8eab1cda2b08ad74043ede85187/ragiwenopajo.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/sagesoduposegetozetakofa.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/biletimatavoku.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/dd24489d00b7e8bca5de0c93c341992c/66893410585.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/mabiviwiwipakuju.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/kexop.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae916f3a689---leduf.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/21894846691.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/jalef.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/denoxagaretoveveribam.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/famelomubukuk.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b8c89f14e---3014809471.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/76277785139.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/zetobe.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/7f778b269f0137d466ff1c8f3f3a3aed/fuzubibomisobafuk.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c2c9c4fb20d6e5edcca1d9384a7f655c/95776282753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dungeons+and+dragons+monster+mythology+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_off0000d7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C2 11068 bytes
SHA-256: bf99f215f2a3ce6285b0e0a71568258441aff548a1b29a9fd7154644ad8e4fb5
font_01_sfnt_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10951 18244 bytes
SHA-256: 560dd12177244c3861a5603ad12759a7383fb51b5d90c6a5dcbbb60bff255f72