Malicious PDF — malware analysis report

Static analysis result for SHA-256 2759616cb9094af2…

MALICIOUS

PDF

87.6 KB Created: 2021-08-15 18:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6437e325a19c6c0c9e0c137b0ef4b9be SHA-1: 8b14624a8e8b32028be7db72a66d16c24e35a3a3 SHA-256: 2759616cb9094af243758eabefac8f3d8b8bc0d68bc05fae02bb31bfd6ec2b81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous PDF files hosted on compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the link farm heuristics point towards a phishing attack, likely using a lure like 'maersk bill of lading' to entice users to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://mayphotocopydogia.com/upload/files/91465599854.pdf In PDF document text
    • https://szekszardportal.hu/userfiles/file/valevokobobosidevagaso.pdfIn PDF document text
    • https://duvanco.be/docs/files/bazosegurilofoware.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/58021069720.pdfIn PDF document text
    • http://gerocuki.hu/user/file/73282201961.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/dekemuzakib.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/68330068d638329a1aee92575b85ac48/65411436366.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/21826784594.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/9760444323.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/l6l24d6hpkn7avnq28jlkq4djt/11503875699.pdfIn PDF document text
    • http://vanhoadautu.vn/static/uploads/editor/files/geratojujog.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dfba082a0f1---wisitinomov.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608361c6035e2---jekotijituvem.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c673e0be2---nanulerez.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/97154587139.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/befuw.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d51e389bc9---85528515154.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d800def2512---sozufemisitipotileson.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/72924177698.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160da901801878---gasusonaw.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ph329a2n4k9h6sas2vkf4ml3o0/2340390518.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/53743606915.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/42444878216.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/521d4faba4ab4c4be4fc06116a790e00/63563454858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=maersk+bill+of+ladingPDF 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_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 20136 bytes
SHA-256: 6ce056ad67a6f778a69bc5f7da634a84562e046f773b8a3af71a4aec00ec6b6f
font_01_sfnt_off00011d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001357f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357F 10656 bytes
SHA-256: 76b13fb1997a42a60381c4584eb2654792abd08b420b27263cdf48d0756b45fa

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