Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac3658d2b9cb03d…

MALICIOUS

PDF

96.4 KB Created: 2021-07-01 21:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce15d03154f5da6e7beaf3f6f346ff2f SHA-1: c033c048495a658b1564329f01dffb4d90206f6b SHA-256: 5ac3658d2b9cb03d627a1dbea6e0d15c15724bcca7e9e3b98ed056dfee23ba22
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit kits. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/feehp7beir15dcfl7q8ee9veh6/xakox.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a170e6385f5---24033866959.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608102c6a04a6---pefotazukijum.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b712bceda---palutuwugenojazalug.pdf
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/xifitasaba.pdf
    • https://sasalidayanisma.org/uploads/file/92522970428.pdf
    • http://buyyoutubecomments.com/ci/userfiles/files/28453216901.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/75088ceb52a9ae5ca60e93e4ca48a84a/25287203420.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c8022b0f61495139a48ece9d67e19253/konorewu.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afd8f83eae---xavegifenivegupuxapixuw.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/fef459ec5f4454e15c8648abfdedfbf8/1636472242.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/a0a3aa0dd37d283f686b4a6e250845f2/52118258668.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607750bf88e14---26455656394.pdf
    • http://www.benyowsky.com/resources/files/15530130278.pdf
    • http://jrpst.pl/userfiles/file/38966954720.pdf
    • http://www.ujepites.hu/userfiles/files/venasozugasenefupepubefa.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/9155990d87021afed7ea5dc431beda78/942777457.pdf
    • http://scamps.biz/userfiles/file/ketuzomixiwidomufaforuve.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/07aa2f530aabd32fad3a75e87f01ff04/9163740032.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/66227727885.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/bb4e13593f26b779fccc726e2199de21/91842677544.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d5a098e326ffb6e2da462e245232c216/mimigamijurisafu.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077b9cfe36ee---pabudapitebawofo.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/1radi3ra6p1uqrblqegbno90lm/31143796134.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3982ca2ea---13393840532.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077d3d016803---bajogi.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/593848e6b486419bf2bd54969b73cfa1/69901047175.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=formative+assessment+tools+examples
    • 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_off000115ed.bin
8a28d9b02e98c28ffb9d98d001ebca76cdd5b63f511687d8d0b3f46ed48f1f42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115ED 10560 bytes
font_01_sfnt_off00012e09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E09 16792 bytes
font_02_sfnt_off0001461b.bin
fc4db3806557aecf1b21eeaf1fa8f72d55786ad985470395809860c527129001		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1461B 17500 bytes

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