Malicious PDF — malware analysis report

Static analysis result for SHA-256 f203922e76d3862a…

MALICIOUS

PDF

86.4 KB Created: 2021-09-01 03:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4284c1d5a6be7639062b2faba962f24e SHA-1: 300079d189fa14ed0c5c4326039e5591bca27d94 SHA-256: f203922e76d3862a7a48c02425cb5b8ccef553b47e0f3078b0e0ca8d7b48e311
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these linked documents. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://angel-juicer.com/FileData/ckfinder/files/20210623_93C3C86EF895586C.pdf In PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/tojaromira.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/8df146181712f0a27b7662b4e8eb25fa/newam.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/60078246299.pdfIn PDF document text
    • http://staropolski.net/Upload/file/21567194539.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/30613214577.pdfIn PDF document text
    • http://izdepskifamily.com/clients/1/1a/1adacdf247316bc4617b3617d965acc7/File/kebegubenogavabixa.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cbffee542d---86681979501.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/17077549576.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/53894501142.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/36088869958.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/1860536940.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1f850cd38---74434258020.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/redijutefobedazuketimeje.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/13fff944b05d690b086eb7a538f5fefa/51525942377.pdfIn PDF document text
    • http://thevenetianmask.com/clients/71561/File/49845330211.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/magiwu.pdfIn PDF document text
    • http://vina2002.com/uploads/files/nowuzipul.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/79960384189.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/c56bb98bd9e551e62ee6503dacc7efa0/pokalunuligedason.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/jokikojuxafigilomenu.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/nuloluluval.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d776d530e42---konedobi.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f67d2124b---63385085743.pdfIn PDF document text
    • http://fairview58.org/clients/b/b5/b5cf5456a34e3fefef15e35162a7177a/File/pewesexuf.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/28f7023483eb07bf30c6e6c42b96802a/xosixurejojanox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=spotting+years+after+menopausePDF 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_off0000ead2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD2 10944 bytes
SHA-256: 017e5063038023533adb082e9abad3f40412be37c96098cfbe9628dc12d0573f
font_01_sfnt_off0001043d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043D 17972 bytes
SHA-256: 319d82fd024168285d35a5be287a61bdbd4c9eb8c3b7909f198a5b56b56a6b15
font_02_sfnt_off000132dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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