Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff0e268f8ff6a12…

MALICIOUS

PDF

78.8 KB Created: 2021-09-15 22:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6ce84139e10da67d7b876ebbed3dcfc3 SHA-1: 60793a9b8fc7233dfa9599d115b351e810a70767 SHA-256: 3ff0e268f8ff6a12e28fa093eba93b9226b6eaa22e81dbd3894f860b2b96f6d3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to compromised websites or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the download or redirection to malicious content.

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://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/nhr2st3v7pe3hfldnkt3edsfom/popabomizewevuxopuperugi.pdf In PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1066e28f2---magesurofuduw.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-12/20210912040304848975.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ada6477aaf---78237856412.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/85297861232.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/motanalixomabubekel.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/21652055310.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138267a044d2---52261025461.pdfIn PDF document text
    • https://andana.us/files/files/mesenulonujeso.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109050817484285.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/pixiregerujizaf.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/841bda8c95dba9272d0f36010bd57dc6/49472650753.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/jalubiweruzejik.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/28110739585.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202191244796573.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109101322097405.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/8584959345.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/wigasitulanox.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/44617959024.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/99319203895.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/151714413561.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/32294013670.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/japubonasigeselopusuzaje.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/vizagolafozowuduni.pdfIn PDF document text
    • https://kapefashion.com/files/files/ruwonezotuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=wifi+wps+wpa+tester+for+android+10PDF 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_off0000d678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD678 10696 bytes
SHA-256: b88c91862d34873db5a04972744247c1d67d0c65e18fb74c09a2feb8ab673328
font_01_sfnt_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 14980 bytes
SHA-256: c59b71bcfac343494fce018a608ebe8012de2660cf600766d17e98323fd81164
font_02_sfnt_off0001152e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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