Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9e2ba66ca518fc…

MALICIOUS

PDF

96.2 KB Created: 2021-09-18 00:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3381047475e554fbc619ca69619e808e SHA-1: c6aa086bd8ba489184950ad4264516a30de14eaf SHA-256: 4a9e2ba66ca518fcc1468c841960bfa3a98210c0f3ea0666b7a5e3549be73af7
164 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. ClamAV detection and ML classification confirm the malicious nature of the file, likely a phishing attempt or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=aplikasi+edit+foto+frame+polaroid PDF link annotation
    • http://musicfriend.vn/public/default/ckeditor/files/jotulakelirawedolelid.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/ranobukajazozobefok.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/tagif.pdfIn PDF document text
    • http://faradbox.pl/files/file/98352951011.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/posefotisewafutuvufititax.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba08a7dac3---gakexadubikunopako.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/69209588152.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/89888157360.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/durumolukowofijuzav.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/9351867819.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/bonepanusuzatusedal.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16143641b01631---97650968008.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090612364973499.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/pirolurujorij.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/rafifatosejer.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16139b39f5a8b4---wizazoxiborup.pdfIn PDF document text
    • http://vejwun.cz/images/sorofilix.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/84484220593.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/67779423067.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/xupuvu.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/wetonimem.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/84491875339.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/98996098991.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_off0001147a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147A 10628 bytes
SHA-256: f6a9493e75796182901193acfe62e86f341f0c0ec465e714b9940cb0c6cb7a53
font_01_sfnt_off00012cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144ED 17636 bytes
SHA-256: cc60e1e331ba410eab7947e9d02c44598c50c0dfa98bb50100f67bd6168ae81f

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