Malicious PDF — malware analysis report

Static analysis result for SHA-256 6691f5199005a93a…

MALICIOUS

PDF

85.6 KB Created: 2021-08-13 07:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dfce58d844b603deac45108ce8e82c9b SHA-1: 27a8636b44f5191562e422d184f38588b1158ecb SHA-256: 6691f5199005a93a9d7195ba7e8fa9cb9c4a994936a4cc61ea820c979c5fa555
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=cuento+de+caperucita+roja+corto+para+leer+pdf PDF link annotation
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/41247087452.pdfIn PDF document text
    • http://agrion.org/upload/fichier/77219258945.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/6qjkmmtdjt7tctclmuhv7be8q7/67066387685.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/71af62dbf3f61b3285a26a405c0a04ca/dotarekazape.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/10f40d4f1356770ddd6d25473331a13c/89021644361.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/q7ja8d1decg9gtfrha2ddh3kn6/11654353856.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/83136122509.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160beeac47de78---fevojediximatemozavow.pdfIn PDF document text
    • http://silver1979.com/upload/file/16269534875.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/muxabinof.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/35525096984.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/voloxutukegu.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/57031761366.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/61228620433.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/66166738542.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/c5avbit0dokqldppdvrlhkt6n8/vodojigageruf.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/77315074470.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/pazafivufaj.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/74025092174.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/lefafirobesukinor.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-4/20210504050216199008.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/tuxoreposogepijok.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/rugepokoguz.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_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 18056 bytes
SHA-256: b325952cd54bf22988f7b9988319daf9ad7b45b34dd903ebe343c97dfec74084
font_01_sfnt_off000115bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD6 10704 bytes
SHA-256: 3e5300f2092aa884aef289906be3fe7f58cc37be3ca717996e42130bd96f35cf