Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec49011802a0666e…

MALICIOUS

PDF

80.8 KB Created: 2021-08-31 14:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 826eb57d23aedcddc02fcad9f8451640 SHA-1: 5d3e0ffaa608a583d3ac9baa893a5d6570aed752 SHA-256: ec49011802a0666e4697a289d5aa034818a85ca2685adc1823f6afac0304967a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The numerous embedded URLs point to compromised CMS uploads and link farms on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://synerhu.ru/uplcv?utm_term=hard+ions+hypercalcemia PDF link annotation
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e657fe319ae---muwonirudivibizeberiko.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608324b003349---gigapujowazigivuvume.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/64317380683.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/13271218232.pdfIn PDF document text
    • https://heyratacademy.ir/file/nulodi.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094441c0f073---mupatakejekok.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/73973121200.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/9bn4o3a55v48ik98ai60h4hodc/74080923419.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/lelisasetozozinovudewa.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/57219562741.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8900315c9d---xezaribubogenofovevewile.pdfIn PDF document text
    • https://path.mn/userfiles/files/dadexo.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1fa22ec468ce7aa67afc023f70c7457f/lumemomaralugepuwu.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/39523537638.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/99c72efa67713ae83271b34986b16b9c/nuvaputikivejevimonaj.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/79107661800.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/kutasesifopusejubij.pdfIn PDF document text
    • https://tpk-m.ru/files/file/pajudime.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/fedaa13d178804d37c12ee11bcf90039/laderowo.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/vajigudezarel.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f45be5637b---gojekelobijunojam.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/97126220778.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/77644039129.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/piguxajibigup.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_off0000d722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD722 17328 bytes
SHA-256: 41cc6a5c181999b6439c336c1aabbce9847cd2a175b4b161373462210b736310
font_01_sfnt_off00010423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3A 10784 bytes
SHA-256: 999fad7fb413b0d55bf9fe8b11775945420ad36238dcbb1d8d087319c53afb29

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