Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b86b642ba406360…

MALICIOUS

PDF

90.5 KB Created: 2021-07-23 13:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7638370f88bff4a04ac9ab8d67c1913b SHA-1: d63bbea5693987386cf064245b69a6272ae7c50d SHA-256: 4b86b642ba406360702ffe17a52ea9f12d93d6a1758e2ef9038da43df0710c83
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm designed to direct users to malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass security scanners. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4de1fb9a18---gitojomatezawaxepusupi.pdf In PDF document text
    • http://brmxn.com/userfiles/file/20210722142941_u6zbmi.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/47768798500.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/82203453245.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/65788138998.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/80285943232.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/datoketip.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939e01ce6ba---jumameworenog.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f33148510---muzifuwedemuwanaxibumiko.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/bulafivavevonaxotu.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073adee8da65---dixiwewivedofe.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/7767931117.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/62402335404.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/sadobug.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/pavuxosesima.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/ribitevivoguwaru.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/93007609655.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/nevuni.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/180642492204.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/74539741749.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210516205405812.pdfIn PDF document text
    • http://cutencuddlybreedables.com/_images/file/dupefawitarob.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071d456cc5fd---foxorejumozuzivub.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/9395809793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=naruto+ppsspp+goldPDF 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_off0000fcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD8 10316 bytes
SHA-256: 0b6def75dc4fef8697e102d8781867853c7167e3d5ff6598cae218b5b19b7a6d
font_01_sfnt_off00011409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11409 18424 bytes
SHA-256: e86b9542ddf5b70d78219e617f32091590eaa7390e89aca79db1007053846a46
font_02_sfnt_off00014375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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