Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9e273fe16a8884…

MALICIOUS

PDF

85.5 KB Created: 2021-09-05 20:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6e94df248887533d2c9bf069053f43db SHA-1: 07487766bad20fb522904d8967185373f588765c SHA-256: 5d9e273fe16a88840ad1a347e78c4e3e1209d7597bd216f3b028880644aebb3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm to distribute malicious content or phish users. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://baigeleather.com/userfiles/file/63400804325.pdf In PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110ca4ecdd16---letupev.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/13692194893.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/75974433858.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c576136133a---19877288553.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/58e5a7cacfccbd682cd5daa44e5a5f35/pajede.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/lbamj6jts64onodsp3d1o95i6h/36495610997.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/56647337255.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e35f3f5fce4ee1d4eeb456bffa83c020/18124913011.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021061311453962.pdfIn PDF document text
    • https://bak.vn/upload/files/17970399481.pdfIn PDF document text
    • https://empresa-venta.hr/files/dizanepisixi.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/nitvsg6s21gfe3k6kkcnmi4265/63434285864.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/88489408210.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab01bb8a461---23607643359.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/bitiriborumakatewifuxo.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/virewopi.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/16223983963.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/aqm3sqep4bc5glv93pca831gqm/75448005763.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/getidamafap.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/77359657848.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/70262982790.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/77555405413.pdfIn PDF document text
    • http://tcihk.com/userfiles/4954339283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=liliana+segre+libro+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_off0000e622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 19000 bytes
SHA-256: 3382ec8fb9c2cd1aaf0df166f57f02aaf046a94bf08fa286603becfc39106552
font_01_sfnt_off00011823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001303a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303A 10672 bytes
SHA-256: d57dad8b19ecf7e79465be19a629de81f8dc496c85396a5f881de2278bd018b7

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