Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49b1fa752d65957…

MALICIOUS

PDF

81.1 KB Created: 2021-06-25 16:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6782940f8cc8b02bf4029351e89f03fc SHA-1: 0a74cd4bda36cbf84964b685ced1cb5310cc66a1 SHA-256: b49b1fa752d6595792c6cf989ce808b6b930225036314e78b116f0c4d8f6e4ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URLs are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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 http://ankaser.com/userfiles/file/9615986111.pdf In PDF document text
    • http://group-anons.ru/userfiles/files/66284836520.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/43bd62442c3a02592755c2c78363c0b3/67689472822.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/9262264494.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/38302275760.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0644a255a---dibidajotopalavulex.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160774c615e983---fasuxujeregenorurakorut.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502112408633152.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/97108578138.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621542673.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/e0580f315af0ac7acdd14caad1d5fc73/wusafavadovenogukubosenef.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/18d3e8662a6e2fd46c2d254082db2855/33918013384.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a38188bc1---wivelikozelob.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/31851980978.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cc679f05631---titijonibonisavinixe.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/u52u5f82goa7e0d2uosqiv1kh0/205528705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=material+traceability+procedurePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0ba6a6b6f995420f0842271849813e1c/kumujetuzotidefuxadeselen.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_off0000dade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADE 16716 bytes
SHA-256: 9167ac746f5671fb8120321e174bb2f1e284736745672ed0ba718c7ed62a95b1
font_01_sfnt_off00010620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E37 10584 bytes
SHA-256: 3d0ff0980f525796bf9b5b21ab05f060f35dbb8b775a741b3cd23874f05064e3