Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b25e5de403ef27…

MALICIOUS

PDF

81.4 KB Created: 2021-10-13 23:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5bad60cc7fd7b7639333fba755c52fae SHA-1: a9a32e161db4dd4d1ea4f5c4e1ae060fc0faca9b SHA-256: 62b25e5de403ef27b8ea348466dbde56d26f2df5cee3b637d393f3bc87dd81f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm that points to multiple external URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/gt3oqcdt5lar88hv0j9fg2a8pr/79820552310.pdf In PDF document text
    • http://weforyou.it/userfiles/files/57646835187.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/magaduzelelarujowaruzaxu.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/61267689555.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615f821a70501---19549522006.pdfIn PDF document text
    • http://abc-tel.ru/data/File/72066072785.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/wopifodotijubuto.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/levulazok.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/rivurad.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3c9d54e75---xazutabi.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/96613549004.pdfIn PDF document text
    • http://anm-av.de/uploads/files/67875001403.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/dejane.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/fizozakagimu.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161463852aedc4---38667862567.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/kolegegezuxusabeziluj.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161651f2fb8531---36380208671.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/f0706ad036a12806fff9a5fb52424c61/dewowilali.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/gemapirageko.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/63681255663.pdfIn PDF document text
    • https://avukatwebsitesi.cicasoft.com/upload/files/21824772945.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RC0zOYPQW8A/uplcv?utm_term=generate+horoscope+online+tamil+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFE 10784 bytes
SHA-256: 6740a9dfaffdfead1cc9fef470ef06d4f8797017a5393e2ba3ba462ab58e23da
font_01_sfnt_off0000d6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A4 19588 bytes
SHA-256: 8e1a6c52b58d2dcfd726faca325803ac6f43be77e40e0cb4231cbaf32b3a1d57
font_02_sfnt_off000109ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AC 16268 bytes
SHA-256: f063e96b3b083897171cfc531021e5af877ad8906cd8b821cf436b7b9967938c
font_03_sfnt_off00011fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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