Malicious PDF — malware analysis report

Static analysis result for SHA-256 203953ff58c2f913…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 12:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bfc98cb694e3b4a268b566ccbc9b0836 SHA-1: bfec6b2923e7e7796c4a1c598c1a98b3dae02551 SHA-256: 203953ff58c2f91333cd99c22cb0a6ef911fa1a83d1ec98aacf2fa948f6855cf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The presence of numerous unknown URLs suggests an attempt to redirect users to potentially harmful sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.museopizarra.com/ckfinder/userfiles/files/46494328362.pdf In PDF document text
    • https://alohasafaris.com/files/83407121851.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/ruregose.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161379c6338933---68526878269.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/vapofafibufinuzaxukugem.pdfIn PDF document text
    • http://119pump.net/d/files/foxuveko.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/98123951213.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/mujatoninirajidokozafud.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/46568767256.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/zukapidananonag.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133300058fdc---66073345754.pdfIn PDF document text
    • http://ge-mak.com/files/2672048875.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/vidulurigup.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/robejotadofojotemokiw.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/wulipuwazupikijig.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210904035349.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/95540152510.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/28377991966.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/86469484770.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/wakadelelenedekuz.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/5735469976.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/16739939771.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614716f5dfb60---85968334997.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/wenif.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-16/20210916175011997496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ps+app+androidPDF 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_off0000b043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB043 15152 bytes
SHA-256: dc14b0b67a53ddc4e7e0617b1cf6ae7498d49ab0d317ff7eadba00af4051ff94
font_01_sfnt_off0000d613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD613 10108 bytes
SHA-256: 0965b077539c7f0aa4b234f68ef2267f84c6a7005e6b3fb531ffc94c2b799b80
font_02_sfnt_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1