Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40e7fe574f86bd6…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 02:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a4c98e7e51a5868845db226a261bb4c SHA-1: a8fe81c07cf2d958056548086e8c3046e8cd6020 SHA-256: e40e7fe574f86bd646bc353dfcb6d43371b7405c990ee2a204250fddb520e4fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, likely serving as a redirection mechanism to a malicious payload. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://laborke.ru/uplcv?utm_term=a+doll+2 PDF link annotation
    • http://wskinbody.com/data/boardData/files/4335058965.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/46402759914.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/87016847327.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16143eaefdd065---bomozufoginevobi.pdfIn PDF document text
    • http://rhondachem.com/d/files/51703994331.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/dexer.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210917060237.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/mofidazaxamapomiwag.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135580b44830---xatiguxijuz.pdfIn PDF document text
    • http://blueyee.com/upload/file/210637541227.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/44208369119.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd59392997---68063985902.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/fagegibubelod.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477a473cabc---1088426857.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/18920909096.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/voxajowogudanepudaf.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/85563331954.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/lofajanekanivona.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/webul.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/57310250544.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/13361258648.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/62986339843.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/bugokifidolemedoga.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_off0000d92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92C 9484 bytes
SHA-256: 13e8d83986bb20d1b7bc849bfa4915b2705673e172df50a4acc862380ce6747a
font_01_sfnt_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B3 17600 bytes
SHA-256: 8b41bdb1a06a67fee46bbd538991d6f9b6d44b8c9c07162a6d1fc38892554eed