Malicious PDF — malware analysis report

Static analysis result for SHA-256 49965eeb0cb8c3f9…

MALICIOUS

PDF

82.7 KB Created: 2021-10-20 03:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 42f2d1e8d60e30932623267cf3d30427 SHA-1: de257775f7bd0ff639c382c487812a81106fb48c SHA-256: 49965eeb0cb8c3f93553796baf42b0f9e5fe9b53f5b6d442955a1620d20c260a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to the distribution of potentially harmful content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=wheels+in+motion+defensive+driving+quiz+5+answers PDF link annotation
    • http://hangnhatbanonline.com/upload/files/finewobekoxujapuku.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/19157234751.pdfIn PDF document text
    • https://vanha.kokkolansuunnistajat.fi/ckfinder/userfiles/files/27548363021.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615452e7d3657---22928145571.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/zodoxejagababinexebi.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/17026639101.pdfIn PDF document text
    • http://africareview.in/userfiles/file/katakimopobanikapi.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/pst3g16nvt4jsdchkiifb9dpq7/60613699692.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/41516279812.pdfIn PDF document text
    • https://owop.challengersports.com/userfiles/files/37803906081.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/kixonisukijipisuv.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/kijajepomumobimis.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/583859714.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/69294362227.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/zapepefukukisiki.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/zujegezemi.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/suvitulefiwoxafo.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/65877910231.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16163b6e0a3149---20911555986.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/20653818464.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/f30c90ba2357b0fa337119df2160d80e/womesupiwijaxapi.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16165dff05d60b---32980360216.pdfIn PDF document text
    • http://zerosquareonline.com/file/75301246015.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_off0000db25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 18372 bytes
SHA-256: 4be9097fcc666683d45d266621f0fa813bde4a5c352a5c3a39ee227cf2b2bc0f
font_01_sfnt_off00010acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACD 11384 bytes
SHA-256: 3323ea2ab46f1d243141a77976c60df23211cd567c1ea01f30d38e658e065f69
font_02_sfnt_off00012510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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