Malicious PDF — malware analysis report

Static analysis result for SHA-256 15506bce7d210535…

MALICIOUS

PDF

85.0 KB Created: 2021-09-19 04:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2756fd2f3aead9e159ab690bef9cb319 SHA-1: 43b52cb079d51d9e802fd0583b79d802462129f9 SHA-256: 15506bce7d210535296b68861778397ef0f779620f13d86d7320fc5703bd7bf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the link farm detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=how+hard+reset+android+phone PDF link annotation
    • http://czpohledavky.cz/userfiles/files/zowivopusimo.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/gilisojipesirutowebowuto.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/rajutikadorofiwomibofud.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109072231127199.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/xaritiwutinazu.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/156480141.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210911_025835.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f6f5084344a39bcbb037753d8d0aa03/gomekogugegudaver.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/dasovopitexasisebewa.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/6eg0958bbk322it0fbig3s2fku/82968948070.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/nozirenarekubed.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/86641649349.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0de89d2cb---4217359824.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/gc28coe9l22l6vdulni459necp/gigejaxasiwumerufudan.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/4848228685.pdfIn PDF document text
    • http://climtech.com/files/files/zozonuvotesizepuximem.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f99cef3928378b9eae87cdcced7ea644/reposobefemazivurud.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/52003616183.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/laromugebezufupimedes.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397756ddcdb---xudulat.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/wopom.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_off0000e837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10049 17656 bytes
SHA-256: a3729318feee8e90e78c644758890dd528adc4f158406659ce992b48ecf25c78
font_02_sfnt_off00012e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7C 10520 bytes
SHA-256: 7c29d810a99888885d8a7d9bf36d854688c584e10b5bb514088f70c7aa249f9c

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