Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde2e1e0cd621e81…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 00:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f869455437e02fa7391a68eb43b7ce9 SHA-1: 798333bf8c148433d14084a44e73609a8eff8369 SHA-256: bde2e1e0cd621e81883c7b93aa0cbdaf8096ce4a195879eadea9eaf4a7b28bce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress uploads or disposable hosting. The document body is heavily obfuscated, but the presence of external URIs and link farm characteristics suggests an intent to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 https://aynispirit.nl/userfiles/file/46951816061.pdf In PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/wadiniwefadojatowi.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/66000194646.pdfIn PDF document text
    • http://popmetre.com/news/files/pewuva.pdfIn PDF document text
    • http://meta-min.com/files/lawuwetukakiw.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/97608152620.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/towujasafizi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134c3f0490bc---33282705059.pdfIn PDF document text
    • http://vitrine-prof.com/files/fatonekikabuvanurupanob.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/pisilebezofonigopaxujaw.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/52328680754.pdfIn PDF document text
    • http://www.bandungmesin.com/file/92685468671.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lasododorazaku.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/80228681202.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/fejurogigusugekowuze.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395ccb0b90b---85877604434.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/pufoli.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/pezoguposej.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/lopotiw.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb4632b54a---73597068526.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16150dfb4516c5---17377679797.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/9800337207.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/60973710948.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/zijawemol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=top+tv+downloading+appsPDF 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_off0000b2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D4 10448 bytes
SHA-256: 902182f71de79532c842d9c9260107a35110013734076a62a965741e2dea7309
font_01_sfnt_off0000ca7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 17644 bytes
SHA-256: 597715f1006efcc4fcb726fd1b2897dd618e5f2d027258e4ffd082def059579d