Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd4939aac1efc13…

MALICIOUS

PDF

91.6 KB Created: 2021-07-06 04:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38dc2242090927a16d05d0326faeb941 SHA-1: d3a1a9c5d43ead6a5295269066e0f29930fdd155 SHA-256: 7fd4939aac1efc138fb52334805f9aab72f9168bdc42c833c735ef4105c963e6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to phishing or malware distribution sites. While no scripts were extracted, the structure and URL patterns are consistent with phishing or credential harvesting campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/10901078502.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c065d243c37---4239111548.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5db4da6a64---13290557403.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f6644a59---zetajatojukaw.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a18a2f27c---safogujoxijut.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce1705f6e---71434091007.pdf
    • http://www.hgbehringer.de/img/files/files/xubir.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a18cd20b6---wolusogukafafi.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/60cddddde159e28e61ed2c5e99a0df2c/pisunevetubasajexasu.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce02443bffa---parabomuvuganeda.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd19cbc4b1a---kelagerejukavaxijiso.pdf
    • http://al-bandak.com/userfiles/file/tutir.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65160be2d7---85236542408.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2c140e84b81a4010f699cb719201384/51960521295.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817e7a32db5---20881977224.pdf
    • http://ciccioinpentola.com/userfiles/files/30862716113.pdf
    • http://luberoff.com/userfiles/file/zavupemanatenozeveg.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/5f8c9bd804e309e2fcc042ac89dbd1cb/tuxederibudenogubunuk.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/922a5b8e6a575cf09f669df0f3847ea1/pufele.pdf
    • https://alamansyria.com/userfiles/file/tosofinevipadejazel.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c111542b9---kamazote.pdf
    • https://stijsr.com/userfiles/file/pexunoduvemisibe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=endothermic+chemical+reaction
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecec.bin
07a25fe70f4263706aa73afabad330d2fa2b5b991fe36f02c5c25d11f8100a04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 17708 bytes
font_01_sfnt_off00011b1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 16792 bytes
font_02_sfnt_off00013332.bin
1c1f0f945dc443ef35613cfae8769174b2453ce2916e16b731df3d98127c0989		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13332 10448 bytes
font_03_sfnt_off00014a99.bin
1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A99 16168 bytes

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