Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f97cd311c82f275…

MALICIOUS

PDF

118.3 KB Created: 2021-07-22 10:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 886cd9ac65f4d2547b7683c0be446f14 SHA-1: 8ef327204f7397086854f6892c8c63215d60b249 SHA-256: 4f97cd311c82f275a0b60841ae84921330c52a7b7145aa9a3abefe120d9efbfa
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://termocity.by/pics/files/zibavubasepaxoru.pdf In PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b63ed9a2c82a224d7960b3f3c9005466/35445861688.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/90311382592.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/loropesezagakobumava.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/64758498320.pdfIn PDF document text
    • http://bakerfamreunion.com/clients/1/13/13be4b03bdabdd3a133c3ee64ed6201b/File/kerugelazoxavowekapuv.pdfIn PDF document text
    • http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/50867261367.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/65350844400.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bb2dcd99c---49506553795.pdfIn PDF document text
    • http://iltorg.ru/upload/file/bikutunomugufigakezotep.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/85064803314.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/23f75e36aec69bcfd69e49c7ced8cc60/sizuzupadapul.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/7277136977.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/lirokamusobomamuvadas.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb30e7c374---2239663946.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607914d4c3620---dopepufizaz.pdfIn PDF document text
    • http://teakdeck.pl/files/file/84319201935.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/wevin.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e80bde6868d---42975276856.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806f2999738---guxaxodabawunilano.pdfIn PDF document text
    • http://gdgom.com/upload/file/210611075145696838k3fxrn2dtr3r.pdfIn PDF document text
    • https://estoniapools.com/contents//files/ledojosowifipowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=about+periodic+table+in+chemistryPDF 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_off00016a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18295 11116 bytes
SHA-256: 1e8085de975c2f7cc3a7b41c79cf5432c40eae74f09c912ff270bee5ac932c62
font_02_sfnt_off00019c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C16 17840 bytes
SHA-256: 657f92e0bb15284bb0d26377658ad13420d6de6e3d23ab002a0f1b01990786ff

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