Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2ea3b91fb80316…

MALICIOUS

PDF

85.5 KB Created: 2021-09-20 15:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33d56eeb86850f3fd91f6851eeaa4255 SHA-1: 598e63c612cd42ef2ad5fdf2e766247fb04ba332 SHA-256: dc2ea3b91fb80316d448728ecdfbf414fc571423e6f30ef53693bdbe301f7abe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, indicative of a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a malicious intent to lure users to external sites. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=watch+wonder+woman+2+free PDF link annotation
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/82145253993.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/25260236445.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/74173875029.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/23028798164.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/kegapezodije.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/xiketawazuwilebi.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/wajigajixonu.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/gizopekeni.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/kufukejivusifaruronatopog.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/piveremutavaluxenop.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/refukatadin.pdfIn PDF document text
    • http://rcmo.ru/upload/files/romimomazemurepefajasibe.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/xaraboberutexivopirixaw.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091704270873499.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/tasapetis.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/2888125195.pdfIn PDF document text
    • https://2winit.com/Files/files/85588246948.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/fcceb452373813dbe7b1787b88cab889/58067953522.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/780827358.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/2998005255.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/wefifetixe.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/fj6iljs6501ucrvo2jl3p9gah3/leludebepiwefikuxod.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e50236d57---kiwonejoweko.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/20121047726.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_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 10636 bytes
SHA-256: eac2f6ba21bf1a40a388b8445d8c273fc90165b04253e39b1256344c95f25d41
font_01_sfnt_off0001018a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018A 18048 bytes
SHA-256: 7e0e5775c6f789e2cba73123c2f63e4efb47a0022ef76bc6a8466a366ff1290d
font_02_sfnt_off0001304a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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