Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b91fd8b55571e7…

MALICIOUS

PDF

77.3 KB Created: 2021-06-11 08:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fb96c59926afa3e578d4d8fb581edfe6 SHA-1: 0fcf880a8673ba87a4c7f734fbfc408feaadf692 SHA-256: 51b91fd8b55571e7f11101623c750d98d4c4faae58910f7543ec550933a415f2
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to 'Five nights at freddy's 4 download android full version', suggesting a lure for users seeking game downloads. The numerous extracted URLs point to compromised websites and disposable hosting, used to host further malicious PDFs, indicating a link farm strategy to distribute malware. No scripts were extracted from this sample, but the overall structure and URL distribution suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=five+nights+at+freddy%2527s+4+download+android+full+version PDF link annotation
    • http://www.anjhimayath.com/upload/file/birilelepadexeve.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/03faa993854a265670c3f28bb07ebd67/19161258702.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/q40qtcs97k799f12n1g2l5si1s/36591382452.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088401556118---tupakosimutedewesilitelok.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/6216090345.pdfIn PDF document text
    • http://asfalon.com/__files/file/kalamatakupolalu.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/9531473642572f1190c759491fb3513b/zexulajozob.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/41148379092.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a87136d24e3---zewaxas.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a333cae90---raragadarix.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080ac677ebf4---37563218912.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cb87769a7---32728907097.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/joxireva.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608763a421891---18461133318.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/0e38ac06866892c9fb67d0309d984096/87845281245.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084f50932fd2---25739259312.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bea9245824---lafomuberebufibuximij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 5500 bytes
SHA-256: f5334a4cb7ebbdbdf3e7fbc448fe68611b20054bcb4779aa3f121e19ca1ff6f0
font_01_sfnt_off00010320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 10684 bytes
SHA-256: 11c7bd6add9ad2e73b6ae270863f51872b303ed4be3a3dd5fa9fdcf5665edcb8

Open this report in the interactive analyzer, or submit your own file for analysis.