Malicious PDF — malware analysis report

Static analysis result for SHA-256 949fda1dac9c0546…

MALICIOUS

PDF

75.3 KB Created: 2021-09-15 21:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b633f7728752b782da575429549dc2e6 SHA-1: c4d70ab86f49cd4b5bd36e998cdd0842cb9d2b41 SHA-256: 949fda1dac9c054613bcfd92e25320ad1db7e1bb96e405cd789be72574d9ef45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hasdeu.md/data/userfiles/files/poxafofobit.pdf In PDF document text
    • http://qualityspices.in/ckuploads/files/79230439351.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161311d5f3166b---wakekanurovafav.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/75447225082.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/39854265720.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/sagivedera.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/73625159399.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/83625423850.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/paribelitekexenozi.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/ragenobepeb.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/sukivavujokugosuko.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134642f14231---82141387633.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/c92932ef4f1d32686ca224fc8165e225/vuvagenamimuvetu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0672435cb---kizufaxiboral.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/wunuvotutizarexuxexujimat.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/26296397774.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-05-19-53-39-47.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/feraxupejivem.pdfIn PDF document text
    • http://goldmustang.ru/files/files/44339577849.pdfIn PDF document text
    • https://akemi.ro/hirek/file/jamorubijatinebanot.pdfIn PDF document text
    • http://unityproductions.com/upload/files/sewesefemun.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/pusidavabubesunuxa.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021913950309296.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/82540651930.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/mirajubijagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+wifi+callingPDF 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_off0000c485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC485 16956 bytes
SHA-256: 8ab6cae815de0d585611ac049b82785c6a28ee1775071d4e0718a60d27550a6c
font_01_sfnt_off0000f090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A7 10320 bytes
SHA-256: 460b089cf7341d65c7e83f374e29697fa085a2b592d731fd7f8f534a5aa108b6

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