Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4443dc9a1a746f…

MALICIOUS

PDF

91.7 KB Created: 2021-06-29 03:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44b12bd043205da9c94f61c2a917ce0f SHA-1: f9d87f663a5b9f573372227a9545ca37e01f9e12 SHA-256: 3e4443dc9a1a746f0ff11d4229eed82dce31c7c4dcce30289efb10c0fce3b28c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress installations. The primary purpose seems to be redirecting users to potentially malicious content, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0527ad4a0---69809438000.pdf
    • http://lateonsettay-sachs.org/userfiles/file/jibup.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d44635f57a---58712105070.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/25e04f062d5e0714961e6a835affe016/wefabapu.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/af22cc5312bcb9b104277eac1c5ddf8c/sudedujazibexorunolez.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2981d657bc---lexux.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/459cd74c6982b1faf6ac62dde46bcd17/86316754162.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d02cce9739e---jupemoxamalekomilasawazug.pdf
    • http://solyaris.pro/admin/ckfinder/userfiles/files/35977726832.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d8f3b1af2d5ef6584c566bf88e1818a8/35553560055.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/534bcbcd43856c7d342d85151068624c/98761153807.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/aojme29v29v211gpotmkh1hj2d/mobobitezesilamigerewet.pdf
    • https://red-adlay.com/upload/files/gikupitede.pdf
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/acacb31fe5c14f1bb558f8cc3f41f591/xufifojito.pdf
    • http://chixue.com/uploadfile/file/20210526202218.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210621064119.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b7cb7104d---zusoxamejoz.pdf
    • http://provia-events.de/pics/fotos/1/file/55908520887.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160876a2b165fe---mubizazepag.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/1a049011268b741fd9a7c1c1fe5ac99e/61287859541.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/65pa95m8mkgsksgr3rjv26r08g/defiruretafive.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e56a733ae4---29141326802.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607856c95f6e2---navobimuvunetazifux.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/rtalmkljvklbhmshuokga02gu4/jivigazixaximibasawimolam.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+calculate+the+threshold+frequency
    • 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_off000100e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E8 16792 bytes
font_01_sfnt_off000118ff.bin
0d9dacd6b3225ff0f9ac22b8bbae65d32b83e3b9adc5151033cb0c258f95f11a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118FF 10916 bytes
font_02_sfnt_off0001321a.bin
c65f9cdf9405b968bcb7b961d0f3a8d352ce55dcf074af54d1afc05e2ef0c34e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1321A 17240 bytes

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