Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2bd615deef427b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 11:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 919f85e2778a1b4c851f8b20ca2b22b5 SHA-1: 24524e505032f561c493c0dead476f267e28357b SHA-256: 7f2bd615deef427b20536d9810e3a3a3889b28446e9fd3907f3568ea9b923976
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ailizia.com/userfiles/rorawomuvudetuligobewap.pdf In PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072730c1ac93---sesusuzulusu.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210523074315.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/jetuxufavawinolisadila.pdfIn PDF document text
    • https://medtek.vn/storage/file/nevojipagevodu.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/ferusekiwanitiped.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/89rqri3e0ln53nbd06jkfs5j9c/93885480180.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c476d4e92---timazarumokipitap.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/744aa4af70ba2ca6034d0d9464aca1fb/duguso.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b01080d6a---50345367262.pdfIn PDF document text
    • https://fultoys.com/userfiles/99032040457.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/5759563595.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607543043ae88---mazanuwela.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/uvgv067lm5132hcu481d2k3ikb/85163067662.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/bevekukuzoti.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/0de11cffaa52c7e1e09ba3f3fd5cffc2/gepazelawugugeruf.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/07a68de305c28e164c533779b9f79b4e/77699265094.pdfIn PDF document text
    • http://valeneighbors.com/userimages/84104929333.pdfIn PDF document text
    • http://alkanboya.com/files/file///855359659.pdfIn PDF document text
    • https://buka.ru/sadm_files/nuvamunogovebigiduri.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/fututizidinaru.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/gsncfl9noakvqcu1e0qemvs93c/jodukuzufimuxisepof.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/1999fc0cb666c806b3488bd902325d8d/36043582339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=occurrence+book+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://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_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 18008 bytes
SHA-256: d2530dc97f760ac64a5a19dee2e6a372b17ed09e7fdfdf7cd8238f4e01d18de1
font_01_sfnt_off00011296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAD 10404 bytes
SHA-256: 8e5d4146f488e5f7fc162fea90d37c8c126bc5dca985e3e3d33c0470fe7f3295

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