Malicious PDF — malware analysis report

Static analysis result for SHA-256 a228ec31b0c55562…

MALICIOUS

PDF

113.1 KB Created: 2021-08-06 14:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5bf23b7a6ac690467aad59341d4ed0e5 SHA-1: 8059d7dd7f416ef774b1a0036c0cd17802fcb9eb SHA-256: a228ec31b0c555629ed4a96b62c7443ffb502e9ce9776af0cdd6f101ffebb37d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or serves as a phishing lure. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://irlanc.ru/uplcv?utm_term=android+emulator+for+windows+7+64+bit+2gb+ram PDF link annotation
    • http://babyschultz.com/clients/72285/File/xexokevebulazabedukegimej.pdfIn PDF document text
    • http://skomi.ru/img/files/file/31956607519.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/346413816e6c5bec4864f6e5f53246b6/daferib.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/xatapigokezalunawatibin.pdfIn PDF document text
    • https://iwistw.com/upload/files/65096762086.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/fomovasosegajuw.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160866c537e896---nuwenuranetidifufosi.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ec1fd92ab---6192953148.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/45987367745.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/633580012e15ecca375da82ee552540e/lonebugosepudipojoxenav.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3d52ba51---94504366044.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/puwakadopesifuvofexo.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/rv0uqvvnr5rtdkoj7lv24gtkm1/fetupuzojerejazimo.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/voguderagov.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830deccec29---58032677484.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/dubenoxinap.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/aeql24bce219hnb7p016kumvi3/rorefumozazujukovumokaxuf.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fe5df481896---32574525931.pdfIn PDF document text
    • http://partnercable.hu/files/10179899932.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/pimuf.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/gafilu.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/pofudifalaxodemos.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
font_00_sfnt_off00013d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15595 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_02_sfnt_off00016b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B10 17960 bytes
SHA-256: 0928b298ef1982b26e7572700f14117a75b78b0b3ea588448f632153ea60473f
font_03_sfnt_off00019a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A3B 11420 bytes
SHA-256: 13bdb7a6f702aa3ca33ae51c6c8b1f492194d83588e00cfad12baf678a373966

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