Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b2993e452add26…

MALICIOUS

PDF

110.1 KB Created: 2021-08-19 03:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 19f897e5341b32a66159acb41d3bf35c SHA-1: 207b0d56aafe3bac94b5c79b98b1127f9ebfabac SHA-256: f3b2993e452add26d619df85735e472dc06bf0737a0448d77adcc1464513f23f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating a link farm hosted on potentially compromised or disposable domains. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external links suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/22980998908.pdf In PDF document text
    • https://brahmagnanam.org/fck_uploads/file/vodugemamufeno.pdfIn PDF document text
    • https://kultmotor.hu/images/files/pozisu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1e9c848f27e611098a7d1e1a0547dd5a/fugevimuvedunigob.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/25709832543.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a360b3ce8e3---24131723045.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/97373769662.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/wimem.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107191548592925.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/guzumadivib.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/47754997448.pdfIn PDF document text
    • http://arslanemlak.come/file/10886658977.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608576eb0c84f---89345926130.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/abe0e6c409b4ec962af23e9bc9295982/dowetatuluzobozakibe.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887d4e002fd---33175205427.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/m3c1dp4gpqntl52sbs8ussbsi7/35805707363.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/mivakaxebegizetuxajirilip.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/638b592c47ba11d8bb2321ac28c2eee3/86506890228.pdfIn PDF document text
    • http://airsoft1.ro/files/file/84177935916.pdfIn PDF document text
    • https://agrando.cz/files/file/28600926682.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/sigidizano.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161006c2642b82---87146477075.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/6355295917.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609736ea4a48f---ginuwimedonuwebin.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/811e91889bb87f118f4c11e57081a208/kevezafago.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/3d0298aeb1174ef08d61d6eef023d7a6/gezofekonakageberugew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=libro+el+rinoceronte+2+pdfPDF 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_off0001438d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438D 21152 bytes
SHA-256: d7584f00969636395afc701cb674b3de9b31c2da3819e56c87b1e0a3a32c3ced
font_01_sfnt_off00017a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A05 10500 bytes
SHA-256: ad163693ee8ea0a357fffd9b068c8013dac814ca3798466fa4322ee989f6e666
font_02_sfnt_off000191c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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