Malicious PDF — malware analysis report

Static analysis result for SHA-256 354cdf4c2e34fcb2…

MALICIOUS

PDF

89.8 KB Created: 2021-09-07 15:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2716165377464d38a58bdb7ffbf7207d SHA-1: b7f52856b8cf846d61d94339a52f458033ff17d5 SHA-256: 354cdf4c2e34fcb29376d80dd598b9b331b44436ae8848fb840ed52ba75a0f6c
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of numerous external links, including those on compromised CMS uploads, suggests the primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://itexpertdog.com/upload/files/dixidurulalom.pdf In PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ada91d05b---nofed.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ddeb67a6e52---63864659256.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/56511607221.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210609061512_8buy86.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/50062842315.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/seboxoxoruxutuvo.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/vefolixaxediduxumuxeleti.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071456f0a397---31623372856.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/2grij5a0so31njjv05s70vv6rd/dupibalaxedel.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/28075033895.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072102a500eb---vixadexewires.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/71397665402.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/larexemuwetowumotusinomof.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/57828378119.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/392f77df431ab4547b5f31390758ed96/vemadanulogamiluv.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/03856e057cc0c656a96d43b8237978c4/jebuderomi.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/lebavokegesimenegazewo.pdfIn PDF document text
    • http://sparkpro.lv/content/file/12188767049.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8531e26b10---16476810555.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a07502667---dotalarijirije.pdfIn PDF document text
    • http://edgecs.net/documents/22109884409.pdfIn PDF document text
    • http://babamoleskine.com/files/file/40790686455.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/28608309702.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/muzusegewavusazakido.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/1ue4add3f29h5fmvjr8cdud5p6/36469263989.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db90cd7547d---60142519430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=explain+the+concept+of+teaching+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_off0000f873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 18752 bytes
SHA-256: 22cafe9f09e389c088916820cf6ab75228310a8dc4138f008a4bcc9f476d01ce
font_01_sfnt_off00012918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12918 10716 bytes
SHA-256: c6e52535bbf41f4a12161c76fd9d35a936c4046a00d69f1d197a0b694427bede
font_02_sfnt_off0001416d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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