Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f18204e623cc01b…

MALICIOUS

PDF

92.4 KB Created: 2021-07-13 12:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a6eacbe55e1ed267861422a06f60a53b SHA-1: 643875b862b5af764ba73bb287b7f5c29b94433c SHA-256: 0f18204e623cc01be0d055a84e8f1a49d1c740270fbc069b1fdb6ab6def6ca35
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, a common technique for hosting malicious files. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5f27c1476d233276c3a94f3a5246f71b/kipavewenusemufadoperibov.pdf In PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606d574908964---vixixagitizaripovowon.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7d2503ee649f7b961b5e1faf2e81833a/merejikuxaputigajelelaze.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/keteruferiwal.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/3eb1ff8eda893e53a22a8d38834a67c2/lesun.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e50348f0294---tumeligulo.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/dunikivejinowuvapafog.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701811453b2.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/golijanalosekelikuxoriwa.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/65604447878.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/bf101100fa4d66c6a9218d99b15796f9/31308110529.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/jomafareronexagoxok.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e040f279ec6---71714328024.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098635e2efbd---13077877797.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/076d3ivd6gi92cins515o1c84d/97183128075.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/milupemejat.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0650293f---pomoturedelofamifima.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/wilovomibebelovuralunamo.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3bc1d7e37---24994193210.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/fe5g2hta91ngkp1h9v6ifhu6ap/lavikuweduzudameto.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/mowevipiromumanijavawos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+would+cause+the+equilibrium+price+to+increasePDF 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_off000106c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 11244 bytes
SHA-256: 572ad20e1c4fd87427cd121c6fadeec2a9916bfd8e092a92f65214657c9dc267
font_01_sfnt_off0001208b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208B 16852 bytes
SHA-256: aa54de6efaee05b614c4f85a6d95f4f73fac7aa8ec87854fd338a56a011d33e1
font_02_sfnt_off00014c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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