Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4413ae6ed74bd24…

MALICIOUS

PDF

69.3 KB Created: 2021-09-16 09:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d101b8637e4c807675d85ded94924a02 SHA-1: 846f08a14614550d88ce5bf78c6575a8b8ee383b SHA-256: f4413ae6ed74bd24c0056d30145af730e355a102e9ca3953a0dbea5ad523bcd8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6930

Heuristics 5

  • 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
  • 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://synerhu.ru/uplcv?utm_term=how+to+copy+text+messages+from+android PDF link annotation
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89494056296.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/pinukenoropez.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/50396228724.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/99914641151.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/getisaguwetazubaluxirux.pdfIn PDF document text
    • https://lorus.rs/files/55791255385.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/lewamutax.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe92d137df---27644909172.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210903_111636.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/fumatetawas.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/72138101039.pdfIn PDF document text
    • https://biomisszio.hu/tmp/tigopaziju.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/171034769.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613444e9198e3---lipafi.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45561897986.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/piwagofavapukerenigujun.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/vifevulazilifomon.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/gelinajepokigafirideduko.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/78762352888.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210909122918.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/kozenarixedotiveju.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161326525cc3ce---14709663691.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/wevesenuvirij.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/93634714375.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCA 11212 bytes
SHA-256: 53c83827bc68fb10b5582b667bd6210f40ac4817c040c2755cde5ae14644dd9b

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