Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b5f2e22d544dc0…

MALICIOUS

PDF

112.0 KB Created: 2021-07-16 12:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5f845d3e8735333fdf9c5ce42def1a8e SHA-1: 78c38c708b0ce9f2b893ce00f9dbbf519a2540af SHA-256: 66b5f2e22d544dc094509c990648277172e87d166accf2784dfdf061457465f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage, with multiple distinct hosts hosting PDF files. While no executable scripts were directly extracted, the nature of the link farm suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

Heuristics 6

  • 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.
  • 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://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/7s1r27gejg78a3vf8co0ajcf88/27786952438.pdf In PDF document text
    • https://die-elke.de/cms/elke_page_files/file/54563732801.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0e432880fc41ff75f1498e117190ac77/nesokimisodekinilag.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/77588168228.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/jelusisa.pdfIn PDF document text
    • http://drironcat.com/images/file/vegawonovaz.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/35041586225.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd77176291b---muloxugixirivimip.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a59310ccf11---jirawulozonuzopaxewewojux.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/zimaziguwutabejutav.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea4b67e11---womozizof.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947732b2032---xuwiwenet.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/8baijfbpt4hrhbqafc939ts73k/fofesuviwizimutikupuv.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/jakavosuxe.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/jonomobutufimo.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abff9cd8db4---dusilifasa.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828fdd58197---pamososerizitubupel.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a114d2a1---21897664261.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853b5ec016d---1560344874.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4bcb49dac---zekili.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/95103179847.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4577ba626---wopuzojegerevo.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1e90e915f---muserurularilitinodeb.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/23bj98sd1m0a9mn99pp7v5d94o/78227816119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=meaning+of+proficientlyPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016339.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16339 29548 bytes
SHA-256: 1f5ee7e334c3dc2c6ee4478aff10780eb6cfe169a3c6ca1244ac6c53795ec029
font_00_sfnt_off0000f9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 4816 bytes
SHA-256: 6711dba581759af15b611a9a85e90f8e9a39cd4e0b55722035a0fcff93905af5
font_01_sfnt_off00010afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFE 26028 bytes
SHA-256: 7f8bcaed7572d183b679c8e73a919ae798bccfb527dcd85df42bbc6584b86d25
font_02_sfnt_off00014b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000197e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197E7 10596 bytes
SHA-256: fe266eba8e37389e898265efaeab4d534bbc230ae5405c7eb252917b5d3b95b9