Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddbbb48be482e082…

MALICIOUS

PDF

90.5 KB Created: 2021-08-29 12:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 70fc0f8ce643b096e82fc1b64987e5f4 SHA-1: a83126277303ff5107f3047429fe4a69a653b494 SHA-256: ddbbb48be482e082858b13cf5630c3614f4773809cb268a92f15179d6a78aa44
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, which in turn host other PDF files. This suggests a phishing or malware distribution campaign where users are lured to click on links that ultimately lead to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/307b6cf266efe2f7da72e38c6c96f924/76691597024.pdf In PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/gefim.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/pelawul.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/powapopemena.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/9603089706.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/eb40946178bdeb322f1a9cf3956aab02/27088659222.pdfIn PDF document text
    • http://agriturismofattorialucciano.com/ckfinder/userfiles/files/doviwo.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/nuxatoxogafopowal.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/vegakavowepofaxo.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16092fc8ae0f7c---dezawulod.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0af31f99---81888758358.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/9392176788.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/69393096793.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/41035091976.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/fewadoxojesonopatixi.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160775d9c3c744---36097657754.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/wukotipagobag.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/fa1a5ab1cdb070cc2111ac05c46dc80a/zudaruxolerixaxatevap.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4660c6897---moxur.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/bedb2bfbfbaad57248c5cf3f89616942/58533579189.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e35143e5315---lenosorufer.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/ade7f283ecad727c81d0b482c19e9121/97933805598.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/78452444590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=spring+loaded+relief+valve+assembly+drawingPDF 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_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001137e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137E 11224 bytes
SHA-256: 90c73ff4f34b8c4df37d6705bc1d20c2be2159ae55714eb8faca8dc50a2b6409
font_02_sfnt_off00012d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5B 17736 bytes
SHA-256: e0f0a3969df9b9c9aab3831eb6853c1f1a4b026364bcf65279ebd5938774512d

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