Malicious PDF — malware analysis report

Static analysis result for SHA-256 2682f137ac40cdcb…

MALICIOUS

PDF

86.4 KB Created: 2021-06-28 03:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d457df44ba9798c49f45cafc5558ccd2 SHA-1: ff00ad9236fa8c6a590ae32171c6126dd06b05e0 SHA-256: 2682f137ac40cdcb78d2592c49bf268f9fab4d9840a44d3bc5749d13ef86e760
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It functions as a link farm, presenting numerous URLs that point to potentially compromised WordPress sites or disposable hosting domains. The primary purpose appears to be directing users to external resources, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://jlm-kg.com/uploads/file/79167699377.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/pk4h9imfauj14fimaoce7eshaq/88077121894.pdf
    • http://51www.org/uploadfile/file/54f0477e65434eaa208070ad59050650.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/9fe04f5588c410a41d8b83cd6018ed8f/12664353047.pdf
    • https://seerupit.dk/assens/file/denereduxefunexamewenumoz.pdf
    • https://red-adlay.com/upload/files/95617156918.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080758a8add1---fegarovevokubabemu.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/8859fe0a5e8a9fcb6ca0b6c3bd3cdaac/56949627815.pdf
    • https://aduanaldelvalle.com/userfiles/file/bivebosudijigegugeno.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a421c73482d---jowiniruxixukokifogiteza.pdf
    • http://www.nomorcantikjoss.com/file/nazuravotovozesomadeta.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607748ebcf138---danafedowumujobavixekoj.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/tl8m58a7mgvcj8a70vghlfptb4/3029656824.pdf
    • https://htddienstverlening.nl/userfiles/file/60683127922.pdf
    • http://www.jindatunnel.com/up_files/file/32961418553.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/2c7ve1cakar7lr1n1e0grhopem/6523080730.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/duqpgh0g5bqsbm5867hh5iqku3/bizib.pdf
    • https://ecodiagnost.com/ckfinder/userfiles/files/56146443735.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/02435c6eed27f3cd11248e31a9210ce8/suxebiwujimibos.pdf
    • http://abwplazaview.com/uploads/files/lasalekawowupigoxedabi.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098324f53906---60790938762.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d81344cc147---85232141883.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d438a56f771ed4d480382efd1dd3f24c/mefuwilubelenijodun.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/2a3f0ba1fd6aceffb8ff183908103fc6/6564610719.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/qeei5g78o979t19ja6l5rjvp18/36934062625.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160819c9d27266---wubavofasof.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=displacement+of+position+time+graph
    • 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_off0000ed9f.bin
2c92bf226d400620236b278d41c071ddd939b83690c9de63859dcb85db79efcb
pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 17224 bytes
font_01_sfnt_off00011b04.bin
1479962827fd630acf92d8dff1044077bffce04709960b5df5974c655815ccd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B04 10928 bytes
font_02_sfnt_off00013422.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13422 16792 bytes