Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd0679715ea5b12…

MALICIOUS

PDF

86.8 KB Created: 2021-06-26 07:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cea96620f13e20395ff73eed5c9cd189 SHA-1: 0f8bcebb39cecbc8d99be3df90ab3aff172dc0bb SHA-256: 5dd0679715ea5b12aaf98adbc88e6bf251c766a93e4e5cdc7b4244b8573babbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, containing numerous URLs pointing to compromised websites and disposable domains, suggesting an intent to redirect users to phishing sites or download further malicious content. The presence of external URIs and link farms on potentially compromised CMS uploads indicates a multi-stage attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://crysiq.ru/uplcv?utm_term=hypocrite+meaning+for+kids PDF link annotation
    • http://blbr365.com/userfiles/file/1622168484.pdfIn PDF document text
    • https://aashianarealty.com/file/57013967699.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/30833691639.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/79105233085.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad53c462403---60473174400.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc272c3b02---99732530218.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/6scdfk998l8ntpj4niapa4od87/25345468743.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/jagulito.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/45208522464.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/sumex.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/nuxurenutawegepikek.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b085bb22418---32605507965.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/84726399228.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/jutezedesarorubiru.pdfIn PDF document text
    • http://freeski.hu/freeski/file/zaxufubavumosotoxisad.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/wepopipatorojezulewev.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/guzosasawofififusu.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/4e93454cfbd631527e80e5e69bb7bddd/piruguzanaj.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d40826ecf4df549a9ae35a591478a384/gukowozelunodogi.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832bdd89496---bunaxebonudolaw.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74cd895a6---79622830064.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/50110291368.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/winamuvesorufiw.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a16d2425856---88896430092.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/1467c5bafc40c64da67fd28f335b2838/70665341488.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/71404764815.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_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 11112 bytes
SHA-256: b6c4a280b0e207a138ccfba08e1195f030862fb292b65f2632701cc0318cc71f
font_01_sfnt_off0001082b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082B 16904 bytes
SHA-256: 1056c8d477cbaf5536327cdc2062f2a4adda53923dd1a0e4c38c39803b3a4540
font_02_sfnt_off00013416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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