Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e73b69db1d13a9e…

MALICIOUS

PDF

100.0 KB Created: 2021-07-03 07:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21159566a7b58c8ddf775540b03d7072 SHA-1: 232497c2b93bd7fb0c480ae89c3e20300e79c4a2 SHA-256: 9e73b69db1d13a9e0d6b2cebd1b783c890708b580cbd4fb960e4d66966468974
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of multiple links on potentially compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ma4m7kar5em4gcvuqsgbo655kl/62537002862.pdf
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/50362377556.pdf
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/4230509595.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/017ee818b5cfbe5a0c740919fe3c8630/98312049979.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/a8a7755a9c4e72cf658eb8e762dd1f47/mezelobozob.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d4f6966b87f50853563a1c434272895a/dinumuxuxatuposorilute.pdf
    • http://www.blueoak.fr/image/file/64121134787.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/1b8n294t8i82ulq4o0ck6g49s9/30243953366.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a254c85e---sefuzunepi.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ab9d18b3c---lobiganapiwanunopunipir.pdf
    • http://animationcoach.com/userfiles/file/logelanix.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/povajalu.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4931f3f08---10635110738.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/63d318d544dbead4fb21d6c7b08fb48b/16126315381.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/34015907927.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074a49275e3a---87558025924.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/e7bc0ad9d37f38e30ed9e47d864f878b/wufesunufosasivodegere.pdf
    • http://magnachip.cn/userfiles/file/20210512180632.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/k6vlmsk3fa0n095l06n4db3pfm/11768222419.pdf
    • http://pileshoppen.dk/userfiles/file/13228846497.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f38b6c8cca---38169148366.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad83e919830---92315679095.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a28a954a1---14684309985.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c6d19dc87---46003550091.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+temptation+of+christ+2020
    • 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_off000109f6.bin
051dd0f17d309f06e391d19c89e9d9ea6a8a03f790d273cb1a018ddfab04bc78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F6 17684 bytes
font_01_sfnt_off0001253a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1253A 16792 bytes
font_02_sfnt_off00013d4c.bin
e375ed301c1d059de1ad71c4286fd07b88375bdb1ef801576d1d2a246ec0ae9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4C 16640 bytes
font_03_sfnt_off00016908.bin
1d213c816a17cfc34304295b84e1a6f494bad635bcc667e7b79f9ef4a3739f2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16908 10904 bytes

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