Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68b9059bc903477…

MALICIOUS

PDF

101.4 KB Created: 2021-08-15 08:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dfc410b77c74bf7e7bc4f72173e51607 SHA-1: a7cd83aa0202081837ed37c9bb2392d5bee74a0f SHA-256: d68b9059bc903477556ec78c590b90476f9ae173f0dbb4f2499bfeca49a4f62a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=bmw+e92+m3+service+intervals PDF link annotation
    • http://aolisenjiancai.com/data/files/woxesepa.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/57911515758.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb91184f58---38466477451.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/a1cc095c3cf6bf8633af57ba421966e7/gojuwalejanefibutawirura.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c67ba813b2e95d08752d285c638e3dc9/22271216289.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5e86eb0d1---96324349450.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/76411920591.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/51682171227.pdfIn PDF document text
    • http://promador.pl/userfiles/file/59926096175.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/kutiguwiraguzumusemos.pdfIn PDF document text
    • https://projetovm.com/uploads/files/93289999813.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8f956bfb03fab1bf9812dcff6cd97622/lexifo.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/7921637368.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/74073139424.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/21129740387.pdfIn PDF document text
    • http://rapet.hu/files/77654350415.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210626103003003.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/doxuwupusuxa.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29bcd7e7c---79822999824.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160730cf2d8b88---rorutulitoriluvu.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/11779182687.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d76665cb0b---komeremowivademafogego.pdfIn PDF document text
    • 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_off00012386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12386 18524 bytes
SHA-256: c8c61ad2fd67e1c60514552a1b8400f4da5c39eee52f52c4471a47fbcc63315b
font_01_sfnt_off000154ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CC2 10936 bytes
SHA-256: 2f76985b6be2e86fd091a9d6793b18bd251703e75f502a58d86b0eff91a8bd21

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