Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b183ed0f36a6c8…

MALICIOUS

PDF

90.4 KB Created: 2021-07-17 13:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: db7d7d93072369057e979b8a7d655511 SHA-1: da2188de9da0c09aa67de57aec52b65f57617764 SHA-256: b6b183ed0f36a6c86d4a6d0b63489c9e9c85d2d45d310afcd71a0d707ef5f56c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest it's intended to exploit user interaction to lead them to further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/e58792c63979c92fa186e8f672867938/mizedisepezirebepop.pdf In PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d0e2292a9---25326811162.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/78d1a7bdb5ad088243a7c27af7b697ab/66493807938.pdfIn PDF document text
    • https://digireg.nu/upload/54744153199.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881a4d41dd3---fuxumuvoduvixupub.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/3d8563e29db9de53c2f281aa51e7cf93/pasulitox.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f01688f78---65703865170.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/90591828099.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e9b939e2---55237370675.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/gegufawalefovazapib.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/83523062210.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-3/20210503075910901685.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/rufuzemomi.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5bd162f23---77460414832.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce9862e231---pasafojodekijas.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/nadirexutuf.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/zamivu.pdfIn PDF document text
    • http://tfforming.ru/d/files/vebotajeberovuribawu.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/36584013468.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/fadilogesixat.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/89756284929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=weight+loss+diet+for+girlsPDF link annotation
    • https://medlineplus.gov/diets.htmlIn 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_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 10360 bytes
SHA-256: d7a39f8ec762c3943e2b9128b1cf0f51c9ce9aa71bfecab4b9332439a8bce381
font_01_sfnt_off000117b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC6 17180 bytes
SHA-256: 59ca04984b4b2798aa2e4996df618ef8b156f458d71fda11c80fae105c029deb

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