Malicious PDF — malware analysis report

Static analysis result for SHA-256 64fb8a881d0b9d89…

MALICIOUS

PDF

74.7 KB Created: 2021-08-28 05:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: e71269df84b3c1df3de4d9a5f265e47a SHA-1: d68c988713aee52adb1d5a7353ee680c03ab31b2 SHA-256: 64fb8a881d0b9d897e378d01397183cd8f9700a92b15d4116cb31cfd36ef0de4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://lapenya.cat/imgjovesnaves/file/49456980024.pdf In PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a092ea3c88---46615376125.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/28541026824.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/8357570488e0455cb48915f2708eb791/disisus.pdfIn PDF document text
    • https://negaratoto.com/contents//files/40901983689.pdfIn PDF document text
    • http://kalikraft.com/images/file/50472670434.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/70349149359.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/56790309297.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/nexadiradopuvobokopinan.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/130912593.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823a615981b---texasinasutitaxedibifub.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/20669311269.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/85010625335.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/70643551689.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/kupibikiwuxuvaxij.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091fd519f099---jetorerapajinexadagetat.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/werefibokikatasumopuda.pdfIn PDF document text
    • https://fallsplat.se/file/76494231671.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bcc958bb1---rivujino.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e97c7633---modajefawomiwonewuza.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/b97c2badf23bc075017912742eba454a/fagesiwajikuwezirujawaru.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/newupewatolipexa.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/12246646935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=vba+questions+and+answers+pdfPDF 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_off0000c12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12A 10888 bytes
SHA-256: 963befb7960de4e91016b6c5d1395094ade00d3867c18b4645b66613156cb1c1
font_01_sfnt_off0000da22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA22 16372 bytes
SHA-256: e26eb353597be5566840e14ab3104b03953829c2459ced031ebc64205da6444d
font_02_sfnt_off00010453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10453 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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