Malicious PDF — malware analysis report

Static analysis result for SHA-256 1111426903dd1af6…

MALICIOUS

PDF

84.6 KB Created: 2021-09-08 17:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3bec4689d90c5689b1d73efed5ca4273 SHA-1: f1f6a7fbea87de73a03ea079dc5626c36811eab0 SHA-256: 1111426903dd1af66b2ea142bf8610b301abdaf59c4a8d88c3e0c263085717d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs are hosted on compromised CMS upload directories, indicating a potential phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific intent beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://maekuangudomthara.com/ckfinder/userfiles/files/4495236959.pdf In PDF document text
    • http://kledingindex.nl/images/uploads/lakid.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/naxagolujiwetisawo.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/rofedovevomafibuwadupe.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/uun0nmfotk8vggb5hc2ig951ao/lixakowesujifozuvopabowe.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161305a4f5acc9---pomitifurugozurutifes.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/87545741390.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/eeqb5e8l3212dsvb7p3sbbbtvp/87881495126.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/kisasetiwabopodojuzis.pdfIn PDF document text
    • http://raczcsalad.hu/files/bikewagoboferugosixemag.pdfIn PDF document text
    • http://zzquansu.cn/d/files/fidubofijopir.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/23807491068.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/muxotane.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/32063820137.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/dinukolefudi.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/sejororekuxoka.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/sadaxusivabaka.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/31415540137.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/devodituvenuxitezat.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/fiponogidejisu.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-05-22-46-16-92.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210903103048.pdfIn PDF document text
    • https://phukienbep.net/media/files/12288527812.pdfIn PDF document text
    • http://domainecomps.com/documents/files/gufisopulora.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/99034942873.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/64746216957.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/juxepe.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c714e059d---41945020475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=diabetes+type+2+treatment+pdfPDF 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_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 17500 bytes
SHA-256: 078f86803f2d46a85b00d12594bd69275d41733af5605fdf7d922c3becab46ed
font_01_sfnt_off00011327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3E 10868 bytes
SHA-256: d8371f1a8592bfef9f4ad1cd97665149d7f5b97caabad8d0e9b9067f9308d9e4