Malicious PDF — malware analysis report

Static analysis result for SHA-256 622dd13038475f51…

MALICIOUS

PDF

95.9 KB Created: 2021-07-04 11:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41da1e15e0d5e1fc2302b1436c0023a6 SHA-1: c9b7c26f50b86cc99ce6672e0a86b37fab20a7b9 SHA-256: 622dd13038475f5172e31e27453c4787a38065fc54b3b66d42480c1fc005b9cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, with several links pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://wastran.ru/uplcv?utm_term=school+counselor+cover+letter+no+experience PDF link annotation
    • https://mytekas.com/UserFiles/file/fonuw.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc614bee34---ritubufalimapotojimiko.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/68280398211.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a59008989e---47815517654.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/02f9887a970a2fec6ac78e655dd01c42/badulexal.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/975ff05940f5afe0897a30c3d6b2e472/90934195433.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160987582c2f70---kerawofomitowidukeniwef.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c5d72373ca9d544612c2555627a530e/jemaxuxibudikip.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bafe6a17cc5---57758438284.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083eaf67a0c5---duwira.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/pixunetisefedaritun.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/76637433923.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/bcn21r19vo934jat68tn3tnic1/31439399230.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c433eb5deaf---pepaduboxiwobipuzum.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/nopevi.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/60846378399.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093ae1c021da---lilapawusulotixijejonewan.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a489db57dd9---2946646043.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/87832898885.pdfIn PDF document text
    • http://mfahk.com/upload/files/neguxefewezeweboririzifi.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29083875110.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/58663402104.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95B 16392 bytes
SHA-256: dcdec0827f96c12e21a771ddf42f8de47a8f41441c75e41319e9ffc01d1f4c3f
font_01_sfnt_off00010fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE0 10652 bytes
SHA-256: ce1323e2b0b39291ab672cb50516c154e97a157899d31a5d201f367458755663
font_02_sfnt_off00012835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12835 17960 bytes
SHA-256: 053c111562c67ea12f0ccb950c7a5afc27848bbef8305bb6c6c4c61935236d3c
font_03_sfnt_off000157c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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