Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb221f2372c4a956…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 00:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 779f2687e65704b53591a307e5b2217f SHA-1: c82503559250b3ea09804218e08a19759d49fbf4 SHA-256: cb221f2372c4a956748ff254923857924a7cab034ffe854e64f6a4f620875569
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous disposable hosting sites, likely to distribute further malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=pdf+to+pptx+converter+software PDF link annotation
    • http://www.medicellbank.com/userfiles/files/56650146366.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/86377648505.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/61978798869.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160745b655cb50---56398816589.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed2493b7ffa---mezomisutuwuva.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/laxozitovigo.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/puradevobi.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/dubererixiwuw.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/sdocb9lkqge0cappmjbkih5c21/susumotiz.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/pilubapeworasexumewe.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609463f15b0a2---29106955067.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/nukepuwopixakokajemezutur.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/dawedikopasejogaxo.pdfIn PDF document text
    • http://mhspartan79.com/clients/9/97/97d0d0788ec4d6723ba7be3cd58769e3/File/salikiru.pdfIn PDF document text
    • http://shesob.com/file/files/pazagovamowosamax.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/bobowijumonatozudanexu.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/n00f5vjrkfvm6rhortd9ouk9q2/zezakomesubogi.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/8547ec994a05b9cf1b0d7c0cea70a858/natemumowuxaretatam.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/vefusojilugopenejexuj.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/savidatanopufinijovenak.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/h1phtpd5fb9opu90ld60q3ium3/juzafepimaxapifo.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc187e6bb7e---zafajitutizexivevir.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/kotuxazagikomizez.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/jixukololenisixexadexex.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/40143319766.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91b43d4e52---josatukovapolagarozurun.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/katunowesix.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C6 16268 bytes
SHA-256: e6cb97be6da41d1b5c3ce72757b1687ec071cecc63ca41f9bcb2ab776ac1106d
font_01_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001180d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180D 10728 bytes
SHA-256: 4b5e1e336f2fa33b24147183dfe6d3e996163fc60b539fc890dd813d61c3c2dd

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