Malicious PDF — malware analysis report

Static analysis result for SHA-256 8065cd257c9a8463…

MALICIOUS

PDF

78.4 KB Created: 2021-09-17 13:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5c6b360cdd80083ffaecade0952598d5 SHA-1: 6c9df3617753d73b7c87e5cc1fe24d61f16cdec6 SHA-256: 8065cd257c9a84630e25ceb35a619de97e8dcce6ed8cfea90c70f5e4d780471e
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be instructing the user to decrypt a payload, further supporting a malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=download+es+file+explorer PDF link annotation
    • https://eravukappalpalli.com/userfiles/file/83388315757.pdfIn PDF document text
    • http://qdcmd.com/data/files/zivefipi.pdfIn PDF document text
    • http://plise.org/userfiles/file/41388847956.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161420d6dac81c---53732802461.pdfIn macro / runtime command snippet
    • http://mawaevents.com/uploads/file/fivig.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/18552802808.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/pemetixagitimejegidefox.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/70082382544.pdfIn PDF document text
    • https://nistd.in/userfiles/file/823160244.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/vonubapi.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133322a61b39---56214123605.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/98527735059.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161359026a1038---sasanunok.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/81239124090.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/vetafiserazawonepabag.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/89777850310.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/xamilusejanekezojapirujat.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/46862708520.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/8035196769.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/15312210008.pdfIn PDF document text
    • http://phongkhamtamthan.net/uploadeditor/files/fesovunewaluzubavu.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/dojeratakejefijuremix.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/20060928262.pdfIn PDF document text
    • http://forti.in/userfiles/file/pudajikudisonazesuxoxom.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/pazukijugiwibinogodowelem.pdfIn PDF document text
    • http://plise.org/userfiles/fIn macro / runtime command snippet
    • 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_off0000cc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC94 18208 bytes
SHA-256: 4f9b4d2e9df0d62a587e08fba232f55b582b45f0e0468d03ade9ae7f6af8e357
font_01_sfnt_off0000fbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F1 10584 bytes
SHA-256: ade68ea57b2574c9734cc98ad5e3e7f2482fb972fc492e4997b463441e6d5b71

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