Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bdb45cd2eaa65d…

MALICIOUS

PDF

84.8 KB Created: 2021-09-20 17:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2176757e1099042490ad0ac986e3d79d SHA-1: 32e05e6fdde66ec0c91d897f3128d16046a040ae SHA-256: d6bdb45cd2eaa65d70f3593f811cdd0cd8d4f951b2192be72d827fbe534be755
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of multiple external URIs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://medvor.ru/uplcv?utm_term=the+clean+house+sarah+ruhl+pdf PDF link annotation
    • http://ms-beauty.com/ckfinder/userfiles/files/81423561685.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/fuvixixe.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/68b6dcada486c9fb288ff96850651893/xodesawumuni.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/53241488948.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/94785948333.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/gerudiz.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb3927f74---65232501338.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/rodipamakekaw.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210911084637.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/bupemurunezug.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/dawukozudijivig.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/41719092461.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/semavemajeleded.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/gigutorinedazusuvubakaf.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_17_17_30_14_7181.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/5453057490.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/26722a6b1eaf6e52e22692459f226231/kebixuruzekoxosevudiz.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/91678543875.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/23299839076.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210913_A461A19351A0C47D.pdfIn PDF document text
    • http://hanifeugur.com/image/files/roxefifirefonizatuz.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/deverikolijipebugi.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/1257545497.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/81059239093.pdfIn PDF document text
    • 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_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 17860 bytes
SHA-256: 577c14edff4df0da1adb6b7a580a2d1e0cc88c4114378184a4a405b61d9d5418
font_01_sfnt_off00011527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11527 10592 bytes
SHA-256: 0b1d08ea6c2f42b7b27dcf57589591216dc0d839583dd818c37069fe8d2f6142
font_02_sfnt_off00012d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1