Malicious PDF — malware analysis report

Static analysis result for SHA-256 c663f144f2acf920…

MALICIOUS

PDF

90.3 KB Created: 2021-06-25 12:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d241d48ca89803c83b5de13afe3380c SHA-1: 1662f241a0b387f9ff1247cee83174d0191097ad SHA-256: c663f144f2acf920d53321142ae755eb4329136e25f75a9abd113b4d62e6a2b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL targets are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/l4erhdbilmd441cq5ejum52af4/karagukuwa.pdf
    • https://debcopharma.com/userfiles/file/8920731092.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6c6721db5c6ea7aabb4b9b6da6bca78b/68192614864.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/aa46215e07913fadab739d63ba853124/45448396170.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/hm8qoovjvab6ob6coe0agtece4/tuzegem.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/a3538897303322a77c5ef60561d16c18/37610565309.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf9fa350e9---rusobupenobipuxudogap.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1ccdbc390---nefanidedaxibi.pdf
    • http://josephlillianmorrisfamily.com/clients/59960/File/kanufimojep.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/f391a0031737ad58808883a2dea504c6/35530036872.pdf
    • https://247christianity.org/fckeditor/userfiles/file/gesiva1621384967.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608656cb32c74---24904656014.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/dfce42f901bcae2048eaf22f3a128e9b/pikusagodigijazexe.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/v8tq1r4rmk4so872d1a58aokg7/gewamurisososiga.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/11414437253.pdf
    • http://keralabiblesociety.com/fck_uploads/file/vanilemube.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074d0c941eeb---82035140087.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/0ok50sgbd771kgf29seifd9967/pawimeroko.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+dialogue+in+hell+between+machiavelli+and+montesquieu+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1c3.bin
4ea04e4861847e9d063440035afaa69743db74a9000400db6c3a448f3233fb8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 22396 bytes
font_01_sfnt_off0001297f.bin
96fe46f86fe29e4bffce82bdbf30ac51b3a69e4cb0ab206d4e4cdc9ad7488af4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1297F 11468 bytes
font_02_sfnt_off000143bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143BD 16792 bytes