Malicious PDF — malware analysis report

Static analysis result for SHA-256 97bc72ebec33b464…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 02:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7af01fa76ee38313e0d6045c5f8858b9 SHA-1: e8de10eb0c67d835059c6f8ef0cd34aeae2fe0d4 SHA-256: 97bc72ebec33b464381de74c070e034358bdaa9f05a45252ad84164322b1ddd1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://whuntex.ru/userfiles/file/joxikeriguxixorada.pdf In PDF document text
    • https://coherence.cz/userfiles/file/5444895225.pdfIn PDF document text
    • https://produse-zilan.ro/files/94579769996.pdfIn PDF document text
    • https://egf.tw/test2/images/file/sizak.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/kupuwobixuzuwiniv.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb0d946a8---regozera.pdfIn PDF document text
    • http://hainfelderteich.at/jarefe.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/75689418578.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/58947339515.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/luzisanafotaxuga.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210912135122.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/40218349398.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/susovatogomekamivezo.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/vezifetunozugo.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384e500ba06---19402023721.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f944cbeebd---80505239532.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/wugenidar.pdfIn PDF document text
    • https://mklaassen.nl/images/file/99954968751.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/54645797246.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/21134731546.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/xisevetaxosoduxinaxerogug.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/gevorukosoxawabemiwa.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/povuwudalatazakofo.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/oncabkp2fbc12ooj6djb54kh5b/balusivawavuwuxe.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613724525973b---kasibipetezusesokeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=where+can+i+watch+sabrina+the+teenage+witchPDF link annotation
    • 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_off0000e720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 18644 bytes
SHA-256: fc1d9318ff1f74ca58a6aa9500c5f2501cb29127912d386aaa909793c3533b40
font_01_sfnt_off00011803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001301a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301A 10560 bytes
SHA-256: 284153dbdfd9aa4f81e59c4e2b5a0b72e9673c397e4ca23334b0bf025900f0e6

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