Malicious PDF — malware analysis report

Static analysis result for SHA-256 f375b5a5e7c987ac…

MALICIOUS

PDF

79.5 KB Created: 2021-09-03 18:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4d4bac333dd5f351a57e7df7cf849098 SHA-1: 15c49665ecad18eb0b63687b0e4246af1d831ea0 SHA-256: f375b5a5e7c987ac74be076d32d0d62e1d0c1349e30873185861819cf1579c07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised websites. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://inventory-acepipe.com/images/uploads/files/dukokiwavegudijot.pdf In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe2abb8a7d---31586057111.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/10524413942.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713d75a4466---diwabirawo.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/gunavogutunisadezumijipo.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/74204101125.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/1082b72dd56984267ea1e3a38c3b4734/26742563811.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a22e8d99e1---buxirewiwozumil.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607422671ac0d---84889838981.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/62839278878.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/77400458786.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a519afea4---27581885699.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/mq17ho77lpa7t0plcl55derfj4/xexuzonuso.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/rutamitis.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8d2937d9629b24e87d72f1aa372bdda9/40905764676.pdfIn PDF document text
    • http://ashioke.com/images/library/File/31752848244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=classicism+vs+romanticism+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_off0000d209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD209 10744 bytes
SHA-256: c5f977300a287ea70be9789270945c60f788c33f81626245f21b83708ea845bb
font_01_sfnt_off0000eaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABA 17888 bytes
SHA-256: d56496ad1c1589fc9f3b9fd54c705f1fc29247b7fe4ee452c8d006bff20023c9
font_02_sfnt_off00011953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1