Malicious PDF — malware analysis report

Static analysis result for SHA-256 b187f593eb919c83…

MALICIOUS

PDF

76.8 KB Created: 2021-09-17 16:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ed6b53a38c0b4291189ed2d948c2fda SHA-1: 9b16b4eab670fec5ea04128779f9f1dfe86a29eb SHA-256: b187f593eb919c83ff7b45e496dd56538855794e517844edc6710916c8e4a8a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to various domains for downloads. The presence of ML_NYX_PDF_MALICIOUS and ClamAV detections, along with heuristics indicating a link farm on disposable or compromised hosting, strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://irlanc.ru/uplcv?utm_term=oreo+tv+new+virgin+apk+download+2021 PDF link annotation
    • http://www.americaninvest.net/upls/files/juzexanufu.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/64029434204.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8e0a333b4---16241045413.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/66117285909.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/73960613403.pdfIn PDF document text
    • https://seerupit.dk/assens/file/81650156860.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/45396185722.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/43876348788.pdfIn PDF document text
    • http://ihdbd.org/upload/files/54067199093.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/54567022948.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/59796771945.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/51666612659.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210910110149.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109100625504668.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/88539449087.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/235d9b7ab470180bff7ddd2c47f5c7da/xafexaritepabavaviduku.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/55852675070.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b770f94c34---20548913229.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210908025727.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/fesojemuxerubewigupobo.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/22044683554.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_off0000c746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC746 10964 bytes
SHA-256: 03c3f3028d9c78cda1e5ad646e5a8ca8c43c6f0ec8b8fcd593e5d529dc0222af
font_01_sfnt_off0000e0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 17416 bytes
SHA-256: 68542d5834c16df9c41ca981001225f660ee262c8b633cbdf783ed63827240ca
font_02_sfnt_off00010dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1