Malicious PDF — malware analysis report

Static analysis result for SHA-256 923eefbe803645d6…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 00:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 447a303744ca759af1c6244d667a4a93 SHA-1: 882f098cb3fbe0080b895454a4dfab589b0945b6 SHA-256: 923eefbe803645d6cdcedcac81d07a643c9d94460d91e711f01d0d957a048df8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to obscure malicious destinations. The presence of embedded JavaScript and a ClamAV detection for 'Pdf.Phishing.Trojan' further indicates malicious intent, likely to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hijoin.hu/editor_up/40088453488.pdf In PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163058477918.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/vavujenorenemavumigise.pdfIn PDF document text
    • https://istanajp.com/contents/files/gipufifapebifawibamep.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/sifokixitib.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613667474c281---zataripuk.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/31286812161.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/risukadefuwogerovani.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/nanirorazetuso.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/fegenogiwukitadoxivez.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/xubuje.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/061b6afeb1bb7c45cc9d70c9c43361a1/zovazasemu.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/3clsfq1ul8opgrtgo6uau29pv1/2379204748.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/13836310080.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/90642edc005d47641e3ed88779b39bbb/jotonudozasizoladujafij.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/31127410434.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/rulifolod.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/30954722139.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/48358717357.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/pamowonepave.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/26773034332.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/70170684183.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/woxulodemoxinelexun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=can+you+get+icloud+on+androidPDF 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_off0000b0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D0 10624 bytes
SHA-256: cabe4f75ccda7f07f219ef3c675bc591f10fa78495717b7d5a2b6945f1558e38
font_01_sfnt_off0000c90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90E 16972 bytes
SHA-256: 38bb5341b924909fd774cdc2ba34ad555c4d3d12b0f74ae5af410377db41d7ea
font_02_sfnt_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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