Malicious PDF — malware analysis report

Static analysis result for SHA-256 c171ca6ac7f73861…

MALICIOUS

PDF

79.1 KB Created: 2021-08-14 21:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b064310eb7fe09b917f3ecd31543c19a SHA-1: 77a0b0b542b4f015b70bb061d7c5215cea16d53b SHA-256: c171ca6ac7f738617a1587a64020c8f82c794aed9619217a92f01f40d8f85b21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO abuse. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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://dribblebar.pl/userfiles/file/rogafedojowoz.pdf In PDF document text
    • http://djapm.com/userfiles/file/pekiwaropenodujugamugu.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092f3c2159cf---lebas.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/kawutukerugumusafovezig.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/sosixexiw.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dovofavofejejelufojesur.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb115068f6---wajerobapax.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/79a5ad3b8628c73bd7f1b23ec3db6d8b/nevunulosujurasavedutodos.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817efe85ec7---54605829882.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/59180793242.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac13a0ac1c9---wawelesi.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/31da0e65b8c30feb505579ec2542310b/zerumupakez.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/zulalilomaverajofofap.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/1tcn9cuvtaa7v6cfttgo1qv30g/tokabu.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3ce43ba69---jidokurafinonevikot.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/3mbf2n7fgrpb484p0gn0godvb5/nelevewekovam.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/43636028958.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/nejukowumesoxusinisutor.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/mipexatogexorapotowu.pdfIn PDF document text
    • http://hongdacable.com/d/files/16857979518.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-07-27/images/files/50792364923.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/65249191662.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/53ct85vdj3ohj63t2bm0a3flv2/28638776985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=supercheap+auto+townsville+opening+hoursPDF 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_off0000d0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B5 10980 bytes
SHA-256: bf2e82eec3b2b1da39886fd1c0a144c999c47f1492832f46647e0816fd2a9810
font_01_sfnt_off0000ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 17076 bytes
SHA-256: a5a341322a213e5d5905bf07c7c1ce29e7480bb5c2bdc27dbc7eb69d5d674bc5
font_02_sfnt_off000116bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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