Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d5a138ed9147ce…

MALICIOUS

PDF

100.1 KB Created: 2021-07-13 17:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c1d604692c461c5e729340e08cb547ae SHA-1: cb9d18723213b06fd60766ddc45f12cbd5f269ad SHA-256: 54d5a138ed9147ce091e29672d7d5655ffb2ed8dd3df2d60925bbf5b9bb53c8f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF acts as a link farm, directing users to compromised CMS uploads and disposable hosting domains. These links are likely intended to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://ketchas.ru/uplcv?utm_term=in+the+first+semester PDF link annotation
    • http://yaqeen-eg.com/userfiles/file/49926679388.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8834dd6003c9953b7e97bb8bd8f172ae/23644923727.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/50150272045.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160764bd6b7f45---buruxaferirubi.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/gd9si67tqc487rhocuv6dd4n7n/nemalar.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/78472309614.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/38761387358.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdb6a3db30---duzokinokifisidakapumi.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/6368fcd413ea253f44f2f8b259cb5862/pomenilegas.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/521c36d0ad9c2bbdd831e8654944a071/41601686413.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072502d48a0c---36975829935.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607da6fa06402---vedigolevuvalirusavorenuj.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/butufatedunexuj.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62372df288---7335436134.pdfIn PDF document text
    • http://sns.hu/_user/file/5102860348.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/n9cbfh205n61b8g7bt5qt8ira6/moxamuvukufa.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/46807e63ae18558fb7471d82f6ed7128/41905977100.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a364e04c339---migegoropabajofalunifiv.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607611c1467a0---filidetimopuwiwekazoke.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/129bd01461fe925faed3d87945a552fa/6194682059.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607527cae817a---zejinetada.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/78053424052.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727bf421d8a---migatoravaxulobipudol.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/3ec5f019892b1aa70da5b602bc5bd813/xafuvifikekimelajewa.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/b53d2e89de7d75209ebb52d6fbfe731e/ridibalilediru.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f922.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF922 26572 bytes
SHA-256: c7b2e3ff56e31146a79602cea0eaee9f8e3a711804d29eb0dcbb50998eac8fdd
font_01_sfnt_off0001285e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14075 10104 bytes
SHA-256: ca4a1c8ec8ee2aaf70b79fb787d210b2ca7bdbb0356d04c1189c662eb59ec956
font_03_sfnt_off000156b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B9 16820 bytes
SHA-256: 3ec440bcc2957b490c4a1d135e1538930c899fc1630bf6c11ca40617772a4420

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