Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b0f84e85063e5f…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 00:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c77e3b56d2ba8de692fb24b7a58d7b19 SHA-1: 719ee05d1a697d8d0cecb3330bbca52abcbc5874 SHA-256: 63b0f84e85063e5fde8b0d256a535144a7d64874ab0a82a0470b156fb82658c0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to potentially compromised websites or disposable hosting, suggesting it functions as a link farm. The presence of a link to a compromised WordPress upload storage further supports this, as it could be used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/57372406123.pdf In PDF document text
    • https://sportcity.bg/webroot/img/content/files/viferetejokumaluxusageji.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/novevizo.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/75819559892.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/16093556211.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210911165237.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/savokaruwopalokote.pdfIn PDF document text
    • http://vejwun.cz/images/vepefezirilalukemejif.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/470a6f5e4a203b5f4efa5b541099d187/vegivazawofugiserunelixon.pdfIn PDF document text
    • https://korankertas.com/contents/files/pajeravojovute.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/89059452420.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/lezapove.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/15502321436.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/numonatizu.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/50789295678.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144722a69953---62121555456.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/81125530104.pdfIn PDF document text
    • https://harmony.im/userfiles/file/9288674604.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/84519859196.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/61926629626.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/voratumusitobaxusox.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/57skncgij1v2h0sunmset7t894/67819481535.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b404187f0---23831486235.pdfIn PDF document text
    • https://kawanmto.net/contents/files/7982770310.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/bf5d946a543c5d275e31e46ca5cba1b5/werugum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=chrome+chrome+apkPDF 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_off0000b497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB497 10256 bytes
SHA-256: 18016e892cf074037f91e7135da1e94041bdadbd46aa6ed5bb3f849c72d43474
font_01_sfnt_off0000cba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA7 16820 bytes
SHA-256: 850977775362ca2b8a28822635959b03d2ae2fdcc5fc64928919a43ff1c5f28a
font_02_sfnt_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.