Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf4676aacbd29fc…

MALICIOUS

PDF

100.5 KB Created: 2021-06-26 19:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3c8fc0dc36cbf0e8a5a14df4830fde81 SHA-1: 1e32bd558c3e6d592e9970757b263081ffc103ae SHA-256: ccf4676aacbd29fca4f3a3eddd7100747b83d2dd99b49a849cf7f42562f4a14a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, employing a link farm hosted on compromised websites to direct users to download further malicious content. The presence of numerous external URIs and links to compromised CMS uploads strongly suggests a malicious intent to distribute malware. While no scripts were directly extracted, the overall structure and heuristic firings point towards a phishing campaign designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=project+report+on+hr+topic PDF link annotation
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a06e55be9a7---kefufodu.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/9154c621ad04afaee4aaecd290d7293a/52285047392.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee6309eb68---doparuvugi.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/nukenimunilutowoposomiv.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/qjdk7ds8andd0b8udp9ek2iqfm/31560547298.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ifixumusinez.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5291f654dc7a146c490664287f35ce26/lukagazulas.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/tepajumidazizomusoxudaxa.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc20d9533ad---78033990084.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/65132317781.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/30dc15a79a089192545fa79dc02ae015/79662102254.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/nl1qdbg5mrghtlqvf3pn7jrtpo/75249772076.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/oc4d9mvgl0kvbn1m3ckn8v1ncj/koluwemek.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/af4dbcb04b992e75438fa631341cc65b/faniwavosuzunezobadi.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d6276f574---46797234542.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/kutukoxenalin.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb33b68ae---foxodumotivu.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/e1agc3h5q9o211v98ub2sd4vl0/43244197653.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/cadcb874df7890db6b5b2928c5d4684a/gukonexoxanaxudumas.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/83330557342.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d6936a3b608fcf974a6247419a8a8856/9010032683.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/earnu05anudfg6c205qkm2hff4/lezujonolitadokax.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/65426482834.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/6257268371.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///64184316422.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff90b8bb1e---bejevegopimix.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_off000126dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DC 17500 bytes
SHA-256: 885c12c2a976dfbe236199229552b64fde361974bfab9f26e469dab019540018
font_01_sfnt_off00015475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C8C 10224 bytes
SHA-256: 318284c15d1cff7b1e2f485d992217ba62939ac0d8c95bf22aada65f9b5902d1

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