Malicious PDF — malware analysis report

Static analysis result for SHA-256 2de6354e22158352…

MALICIOUS

PDF

73.4 KB Created: 2021-09-07 15:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 283081f3adb59dc155878f7d030e9c0b SHA-1: 45958257bc80f5737b5fe8d1e493947bbcf309a3 SHA-256: 2de6354e2215835230442b6c9d8c76031afc6b3d80f040da73eb8c51163e4df8
176 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and numerous external links point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://medvor.ru/uplcv?utm_term=direct+and+indirect+object+worksheets+for+8th+grade PDF link annotation
    • https://yesilkoyluleriz.biz/resimler/files/80740279821.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e11708f0b0e16a7e8ff8b23e50550d75/22282282181.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/17225154290.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/e4b049bec84c91d04272b25f8b0c2572/fimilanizevogo.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e8bc064f---73277173504.pdfIn PDF document text
    • http://saktigroup.in/uploads/bamevovijezupoleri.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/funifirijorube.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/kiwikovogoluxitap.pdfIn PDF document text
    • https://resicolor.com/upload/files/34324609140.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/0q026trg86ks647qcchqnp7sc5/50002734232.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/422a75105732b8f3defe921803e8a64a/ronobuwuwivewulesur.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f018dbba2f---xopumibukapoberisobal.pdfPDF link annotation
    • http://www.aadhar-interior.com/userfiles/file/gupedakupe.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sie5l0g5r0rq40q66sc069gej0/30936713771.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ed6c730e2---99522218471.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/rikakum.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/27339295291.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/kokomefuduzi.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/97414633300.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/70358887823.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d43b4ec37---zisiledumi.pdfIn PDF document text
    • http://fotossc.pl/_files/file/71727131553.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/59966443596.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_off0000b8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D9 17080 bytes
SHA-256: e1364cb6a745ce2a8496c37c637150170f8972ccbeab03762c5ebc9d01b1f350
font_01_sfnt_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 11364 bytes
SHA-256: becba7c18c632e2b95484884b2faf1b31957650b376dd550b1beab451c0f4039
font_02_sfnt_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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