Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d7f24a8244ea1a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 11:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c87b1911d91e05fa0f935c9b9fd963c SHA-1: d8b697435b085047d366271d1b07f86d0923156f SHA-256: 09d7f24a8244ea1a870cdd075a4bdc2ee52d2129e7bf8ac376faf6c876129137
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous heuristics indicate the PDF acts as a link farm, pointing to external PDF files hosted on potentially compromised or disposable domains. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://brandnewgoods.net/userfiles/file/22343523779.pdf In PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/2149774171.pdfIn PDF document text
    • https://ka-base.no/images_content/file/62320193363.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/3384522508.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/gitegopupafuz.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347576b1caa---33218441952.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/nakuwe.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/marurorelikikinogatu.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/22048608333.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/25b84fb965788555ebf70b37f999b7f8/zabato.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090512471670554.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/zetakefa.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/sezexepitesime.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/konugiwaturaverun.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/lidogisoxeroladap.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0248044001630641960.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/xivox.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210907085616.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/xikudifevunadupali.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16138a60181b59---silam.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/11119615575.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/60202733344.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/58259286668.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/ginizukopisudufodawomuve.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/59257662107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=can+i+transport+refrigerator+on+its+sidePDF 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_off0000e403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE403 10656 bytes
SHA-256: f5d31ba413e9e239536bb65ea58185208627f380fe83dd8aae7d27931215fc7a
font_01_sfnt_off0000fc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11470 17784 bytes
SHA-256: 48369d8f64050c68c4233f259e7ce41e0ffbc9e0dbfdd863de63e8ba5cdd7cdf

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