Malicious PDF — malware analysis report

Static analysis result for SHA-256 d213b54d5a0bb8cb…

MALICIOUS

PDF

97.0 KB Created: 2021-09-15 19:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1db1e30384c3b51ccbbf57389cc8383f SHA-1: d04732f7ea6635092b01049fc42f2a178144c528 SHA-256: d213b54d5a0bb8cb4b70938656804a1b979f46a3ec347853a518da3b62c20c35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://heldermusic.nl/ckfinder/userfiles/files/15488718573.pdf In PDF document text
    • http://laserbeautymachine.net/d/files/wotasetezemotasoboxen.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/52472836492.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/16411937684.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/57271881207.pdfIn PDF document text
    • https://orangerun.re/photo/files/8985410218.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/1330902723.pdfIn PDF document text
    • https://remini.hu/userfiles/file/25721269847.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/45140945927.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcc1c4e38---mutokutamujimawal.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/4177230426.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/9248497003.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/13515139624.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9e27f710---mudidirikotofepawojixap.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/miviw.pdfIn PDF document text
    • http://metabolit.ru/files/file/10491792886.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/51841840067.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/lobawom.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/78687118141.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/63885312982.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/bupofigi.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/6p64vav0k5jhte3fctilomq58k/62170233614.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/1132485662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=what+do+you+need+to+make+a+lightsaber+in+minecraft+education+editionPDF 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_off00011379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11379 18428 bytes
SHA-256: e4109d53b7c22b87c52436d11b74d89b7f31aeb4f2dbe53ee60393ae1963c577
font_01_sfnt_off0001434d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B64 11364 bytes
SHA-256: 92c43d6bff10948e9c69afddacd6208aa62a49615e9c845037df6be1e7a5e7a5