Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5e2d51d161789c…

MALICIOUS

PDF

91.3 KB Created: 2021-06-26 07:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7db4483ad297da8ea5b46d93ecbb2372 SHA-1: 1f6664b7e4b5f889f2ece1842024d1b2c9176d71 SHA-256: ec5e2d51d161789c766c6f5f752d3d709386cd9316fd1061dbdd17bfced3e86e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics points to a tactic of directing users to potentially harmful content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60d62b88a0---wopuze.pdf
    • http://alpha-th.com/userfiles/file/75019086956.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/1hr95rvqu3a51075m9u3bngs00/ditexaxunuxuvojanalukut.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/fbm78o5aobt1d63iamnjtdf0v1/63489632431.pdf
    • https://riolospettacoli.it/filesUploads/file/xonisafabibuke.pdf
    • http://baraanduliaptti.org/userfiles/file/35534136381.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f8a0818ef61d8587e3c5544f84c2ff67/solilidudanubilogaxa.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/6fcd4e4c943f56674e9c771e5a0ab7a6/tosufawufajuna.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf9d920bb5---20187983046.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec38a8bc90---47324468179.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/qpcp8655nnlfucsae0r9tcu8h5/gajigamarekavuretogek.pdf
    • http://dermalab.pl/userfiles/file/niwasa.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b616e45b7---49070600622.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/59829f2cb21e3cdbf395b853aa872267/womufivojofi.pdf
    • http://cuacuonanbinh.com/userfiles/file/56711124820.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e883397b3---newovujelibimuza.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607337c4e35ce---29552517358.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0be08ec10f---20308386.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/a22f47fa92be487af1f211568a66d82c/46523352293.pdf
    • http://www.miwon.com.vn/app/webroot/uploads/files/zetavewiweloxezevadaram.pdf
    • http://mawaevents.com/uploads/file/22207822251.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607056da281bb---fapobotowasope.pdf
    • http://mpu-beratung-brendle.de/userfiles/file/kubaxuparigowagedu.pdf
    • http://bafiti.com/sklep/userfiles/file/96222433929.pdf
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/p84uicj5c4va19qjfib6mt0uto/47950534431.pdf
    • https://anmimar.com/royal/userfiles/file/vamatavivagutide.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/nh4q9gbnlrovk8ro88asdstia9/91711613142.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=girl+and+boy+in+one+room
    • 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_off000104a4.bin
2de1dbd4670e29f770d66f135ea3c9dc980117d86eb2484abd9e3b2b8e70e61d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 16812 bytes
font_01_sfnt_off00013019.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13019 16792 bytes
font_02_sfnt_off00014830.bin
9c1fc834aeb99e538a969298f132a3ed723f6e5b363c6adca07395492d3eed5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14830 10436 bytes

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