Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3612976151ab87…

MALICIOUS

PDF

72.5 KB Created: 2021-09-07 18:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1347c7ef0f61c10a8534423d1ec4df82 SHA-1: 643256af853fc8e2e13c61c1de23a78c39cbf6ef SHA-256: 5a3612976151ab878e379eeb145065f47501a20731e584965eb27c1f53f4f552
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL analysis suggest it functions as a link farm, a common technique for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/b0c69d99bd177f2df015d9bfeacd2486/53043959745.pdf In PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c995fb1541---44856455326.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9e5a5d78d5d775a8ee6d290ed3ecce17/lirokudivimezula.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/pozenupofalobe.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072b1d2e5270---tusavavivifizitonev.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/nebijur.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c72c2b9e9a8a87d10bd305ca54e43a65/bivapar.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210906080628.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/98914107423.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/ea07371343070019aac69ddd3cf05a1f/44700548801.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf07658335---morelukemufezaririjagewi.pdfIn PDF document text
    • http://serting.eu/userfiles/files/rufumitonori.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/64391838115.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/6398449139.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9a17b0ee2.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608138d02b796---zuginipenewuzu.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/tokujusutogetepaligu.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210605132254.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/98886797294.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210702064844.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/vilimuxelurejijugejenewux.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609baf6d4e875---vujenanipawefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tinkle+digest+online+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_off0000bb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 10464 bytes
SHA-256: 915dac3a8a831df3b3e7d6c917da1b38fd572a652a8fcd8e8adf58e0512e72d0
font_02_sfnt_off0000eb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 16236 bytes
SHA-256: 5039863bde97f8a71145e698d5326ef64328417a46be7a746acdda6ff2b8b438

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