Malicious PDF — malware analysis report

Static analysis result for SHA-256 798d964a3a6d581f…

MALICIOUS

PDF

113.9 KB Created: 2021-08-12 00:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 8b92573aca77b3cc02eacb08853b3f39 SHA-1: 3576b2f17b039f0da28666f3c0e327f16c392bf7 SHA-256: 798d964a3a6d581f66ee84eee57cd50f6507e13f9bfc09dd0c9e232faa8260db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to compromised websites. The presence of multiple links to WordPress upload directories and disposable hosting further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=protons+neutrons+and+electrons+how+atoms+differ+worksheet+answers PDF link annotation
    • https://5a.ro/ckfinder/userfiles/files/91218359314.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/migifubabibejifirewekadib.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0b162bba5---dugixisibefoxonegax.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160778ebdb0d0f---mefogenod.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/vipukolatakufenaduf.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b451864c5e6---98614883019.pdfIn PDF document text
    • http://krzeptowski.pl/file/jasifoluniwurabubezoxituf.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/asmuqqpq9allkarirok3n0s7tk/lexoluvej.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/98819234405.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/69472349818.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/8120d542765f8e85dfb0281045047d79/wagonafosokigipo.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca18d8480---jufesigabunos.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/42144441670.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070902934619---firimopedikipogelezepalub.pdfIn PDF document text
    • https://agermag.ro/mm/file/wixirit.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/rasepizatixelubofukewut.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/9ee642573d4cb382fa0d3e4549111b68/92107884394.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f986c02b43---38871818534.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075963232e78---lajiludebevewiluwo.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b402e4c4990---godokitomutinoder.pdfIn PDF document text
    • http://deauville.ru/files/file/vufitukadovadeberogux.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/puxiwijaxebapifusubamit.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac69267282---4855305825.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_off000157d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157D9 11020 bytes
SHA-256: 03913a67bf919f423e73af2490f400363ea3601a2528b1a89c04f8e1a2baee6e
font_01_sfnt_off0001714c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1714C 17772 bytes
SHA-256: 28b9f48c6794efcde406b7ad66ee3bc1035543062441a3e120ab8cb3ca6c0fc7
font_02_sfnt_off0001a03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A03A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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