Malicious PDF — malware analysis report

Static analysis result for SHA-256 4492e8ebb1fc2097…

MALICIOUS

PDF

72.4 KB Created: 2021-05-30 04:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8aa6cd43cdc773304f048c46b6746833 SHA-1: 338769f1a2c375f9d9c89a892d089f37f5ebb8a3 SHA-256: 4492e8ebb1fc2097f5317f4d5067a9d2db88ab007f8a84d183f707ca36814939
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/9m255shn5o77o6ua5iff8gdh45/18103042345.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/e675f72109e1bdbb39df6013fbc1a229/zokudomoxeporure.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/7cb1677065a1de7347ff86a91a882174/77361651192.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1196ed6af---74880894306.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/8acf0b7894f3f8a359ecfdc8e2a38600/fukujoxif.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608c52f88982d---81745556411.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609575162e404---goxakupimekaz.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c827233081---derakutabuluxo.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac812194878---10321463066.pdf
    • https://service-panev.com/userfiles/65186165769.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9433562d4---letijarirumuwuje.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722339dca5b---xadonon.pdf
    • http://asea-admin.com/_userfiles/file/20210508124630.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/nruq3lo6rl1miejh6btueu5mc4/xabuxuroxi.pdf
    • https://alternativecarrepair.com/userfiles/file/tutidegub.pdf
    • https://akproauto.com/nbloom/fckuploads/file/riligejununekomuvuderibu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+did+the+alliances+help+cause+ww1
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e074.bin
d7c502cc2df0a4363f7507371fcfbb5225bbc896291a259327e044406e68f708		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE074 5168 bytes
font_01_sfnt_off0000f21d.bin
975209728a14af3da54096e7387c5402cf3d8151bd2be46eef8d447e34246f2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF21D 10152 bytes

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