Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b20a949639dc132…

MALICIOUS

PDF

97.5 KB Created: 2021-09-02 06:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 954207dd1394351b2f506f0ab27966c4 SHA-1: 039b0c311151d4dc2738920b440a6cc022ba2e4d SHA-256: 9b20a949639dc1323339327302cd5ce05ef228dee2de45eb5c65668157ee65c4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=heat+is+energy+that+flows+from+objects+with+a+high PDF link annotation
    • http://noithatphathuy.com/Images_upload/files/23350683147.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-2/20210502122530804674.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/mupoza.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/jezigafadowi.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/karugik.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/62817160512.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdea4105c4---zazawu.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/xaranejaxi.pdfIn PDF document text
    • http://chinalabware.net/d/files/rolelenokef.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b363435bf39---novuzobuwogepo.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/491a7c4457f324cf33fe9c916e257532/62194147563.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/befelijik.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/16539225185.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/50ogeg591r0e1tjiceinpddfrg/57482098259.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/76350468342.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16086c537489e7---widune.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/puturebajidazaworokijopiw.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/53ab8c7e799762dcdd275500ab47e98d/65604642622.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/fetinu.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/rudelafetup.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d744b5d4---4439020838.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0f953586b---saxeforu.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160953b4e011d8---7918429533.pdfIn PDF document text
    • https://ocbond.org/userfiles/files/migilizinamozubawuzofe.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_off000112bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BD 11244 bytes
SHA-256: e5952013c48999d01992b43d93b771dc032ccc827514999561302afa6a4ae861
font_01_sfnt_off00012cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEA 19260 bytes
SHA-256: 88be9bf333bcdbedcbb374926d7fa98bbfa07b3f7db15cd09a7f35a1e4dcd526
font_02_sfnt_off00015f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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