Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce780f03d7d25655…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 14:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1575040532d2172f21cb789ee8039623 SHA-1: 6a1db7e9f2e50fb68e0954d23dec91dc4f69373e SHA-256: ce780f03d7d25655be4fec369bf2852ae180d3407a34ddcc302f66e2770f7827
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/2g6pkafpudhficghunk7ari16h/vefavebikofenugivub.pdf In PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/16113142898.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/fac2f77a5f1497f7cebc3cb3a54cb1b6/dumigaxibuvurumarupow.pdfIn PDF document text
    • https://33mobility.net/uploads/files/61538635223.pdfIn PDF document text
    • http://southwest62.com/clients/6/66/666176aa584decdbf8d0f1e9213c5ee1/File/jivuvelusufizaxanevigo.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/zerilawusa.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/mumugom.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ea45ade4---mupavuvo.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/22726150415.pdfIn PDF document text
    • http://jonme.net/ckupload/files/34684460887.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a124f4a603---dazonitulu.pdfIn PDF document text
    • https://inncredel.com/uploads/pusigexazavomugi.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/8370230788.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607952eb6b400---71672409402.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/f8t674r20ksunatut7jlprji11/nugunofoxugatezumidipak.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/7cbccc77d1c2ede41a9fb7a41e3a10b7/28683739416.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/24402075686.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ec9c7d72d---10298344769.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/tiliwura.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/poxowezasapokebox.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c7a71dcf90---fejagamibuwoxavo.pdfIn PDF document text
    • https://hurtowniaroza.pl/upload/files/zogob.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7f90776e6---60436905843.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/negokijixotivi.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/pupepujopuwupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=farms+smallholdings+for+salePDF 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_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 10680 bytes
SHA-256: b38b18b5ad81306174fdab2e9eaf2e9cb5b23562d44bf731c9fbd2eeb99857ca
font_01_sfnt_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 17900 bytes
SHA-256: 87e6f0567a503ed369b92d33d3caa43440bf86a230b36528b08dd257ad26b9b8
font_02_sfnt_off0001258f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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