Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac9e5e407dab166…

MALICIOUS

PDF

80.4 KB Created: 2021-09-10 02:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: beffbf95b2fe211b4ca38702efe2340d SHA-1: 053a9a3e7f50d59d2f6540cecbf98d0199857034 SHA-256: 8ac9e5e407dab1661ced677a8ba189dbfbbd0b1e3ab6d9c38c3f612f187514fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript indicates an attempt to execute malicious code, likely to redirect the user or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/25987f2933d120497838e141265ccb2b/46811277681.pdf In PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/zopinopute.pdfIn PDF document text
    • http://platcometals.com/images/file/giridemugepofujepodep.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/lazuboworarodiwakusix.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/78797552902.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/vedavebebu.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/46145335399.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/51357250093.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/lulokakagenagekisa.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/45740134012.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135c0fdcf3eb---gozerikivuk.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/98543357233.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210903015423.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/pizim.pdfIn PDF document text
    • http://ilkemymm.com/image/files/50145261940.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210910054155.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/werox.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/32961300404.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e9c8ab207---25675806561.pdfIn PDF document text
    • http://turnyras.lt/Files/file/28520101406.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/28261322769.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/delimejejawuwofefis.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/gevegojosakunezapasariro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=11th+physics+guide+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_off0000d87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87B 10536 bytes
SHA-256: df9d329ed071091b6466217c795dc88e1b4a45717d95918ea823a7b48251ea6b
font_01_sfnt_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10892 17144 bytes
SHA-256: 9fbb64c75a93bb17565cfc26ff3584ca546189881d29dd760b72551d7c24bc4b

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