Malicious PDF — malware analysis report

Static analysis result for SHA-256 4381604c44773ef1…

MALICIOUS

PDF

77.1 KB Created: 2021-09-01 01:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3dd45811dcdeefcb51518f387dc72b34 SHA-1: 7c3ac94e2af2deb169416082025c6beeff8c99c7 SHA-256: 4381604c44773ef1b86a5a971104ee36fdb1bb30ed27c34214c9d78431bd033f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://alituncer.com/userfiles/file/boxevatolerovasetet.pdf In PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/75428352a1abe51abb9869ae892694d5/kulepulexiwunigapumeg.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160805928d945e---81774026484.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81d942c13---ravetoni.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/87509301579.pdfIn PDF document text
    • http://recrute.fr/files/files/wasipu.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/hgtoqjcq45qgfngmgrd7gd7493/gemexexa.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/35475827089.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/26220953858.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/jezetav.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021070407424673499.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/mafokawirogevadarilasideb.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/a1f91436a722dc27d45027be14a75ebe/liguxigeriwolazokaner.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/nepajazulodadeseli.pdfIn PDF document text
    • http://ridendo.cz/files/file/68127686505.pdfIn PDF document text
    • http://freeski.hu/freeski/file/jiledawiledoxobomes.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf048dcdd11---12611619162.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/waxowetawivu.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b7b4bb21ba---98179787509.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa49c937fad---86495412586.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fd0d1609aed---xusupifonetodazuwavewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=bless+the+lord+psalmPDF link annotation
    • 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_off0000c74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74A 10516 bytes
SHA-256: 79525066efa20351b7718e435c813ac70177b81be558bd36526efe91509a5ac5
font_01_sfnt_off0000df43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF43 18648 bytes
SHA-256: 5a3cf4f287930bc9185c8288ebba9476c74bbbc7966bbd48f99578e18f9c594c
font_02_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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