Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b3210d0572b2d6…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 01:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e698d9b06291314ef87bb6a79f972997 SHA-1: 1e47431d182e916f802c873dcb4d15f41f0c2edf SHA-256: b0b3210d0572b2d669bbcca27b619c214757d5b52deea0659400a905c87c3c8c
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external links suggests the document is designed to lure users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=gta+5+in+ios+download PDF link annotation
    • https://k-newsletter.com/ckupload/files/43543536415.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/15937300955.pdfIn PDF document text
    • http://receptlap.hu/files/togatozutujaxazo.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/51546807791.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/9177609200.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/9628195962968cb5a53e27d4697eabbb.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/fifotamakavatiditi.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/sapuwa.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/pezabefijepemevifunelu.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349ce65e49d---10769444811.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/92261993358.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/10/file/fulezoferododawadolokutaz.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/23560495591.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/vedomubapebirow.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/86333997678.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/78593290901.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138710117522---85772547031.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/fomakexewifaj.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161304b58041ab---ropet.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/12626611072.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/38689103174.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/fotuziwegepaxuripodejoxo.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/76057847414.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/rabetadesadokepubopofoso.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_off0000e71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 17620 bytes
SHA-256: 3dee712a6cba95170433272d8f32fec4f10a1d009cf7a5689c06593f0ec98f60
font_01_sfnt_off00011479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11479 10268 bytes
SHA-256: f5cc42badbcf3131d1467567da776cb76a0bf7422b8ecccb66feb877a1a493f6
font_02_sfnt_off00012bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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