Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb58d32991ebe17…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 14:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a1a5fb8a8f9b6e8f6b575eebc5c9bc34 SHA-1: 56cdd6c0ec3ba52adf8df71f1722e9cd233f60d1 SHA-256: 3eb58d32991ebe1722bbea26eceae9f89d40baef3dbeb08ecdc34813b3abaebc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=avee+player+original+apk+download PDF link annotation
    • http://aquaclub.hu/userfiles/file/54285743896.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/gapetapigevigisogesasi.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/bitopebagijulum.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210913195349.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-5/20210905092140161597.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/5220836095.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/169f8cdc7c57aae7a17663500dae731e/57993216052.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/tipazuvunagigavajite.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/pijifavorilorawep.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/wetonimem.pdfIn PDF document text
    • https://efnnma.org/files/file/metakepimuzeponakawaxaj.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/rejixupomefodojowum.pdfIn PDF document text
    • http://beta-rc.com/upload/files/98053306920.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/donegewopozofadimejirutu.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/69144311800.pdfIn PDF document text
    • http://vpsystem.com/files/fck/gigovapadas.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/70828045687.pdfIn PDF document text
    • https://eurotig.ro/file/74846798600.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b75eb2b46bb8b151d590a66bc8201fff/vomoker.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/91010058887.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a82c26a87d---rarejilarabizibopozotub.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/xogakujeseturabotevi.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/potovevirurovokapuz.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210909124313_s08m52.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_off0000d6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B7 16980 bytes
SHA-256: b946513d4df5de3bd24b82950039b6e132629d5a7d6603bf9f5442937925c517
font_01_sfnt_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 10640 bytes
SHA-256: c5e258714ce3423a93b53b156a28066bc21ba234666c93e27292aaa58cdefeb4
font_02_sfnt_off00011ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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