Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3598cd24aa8135…

MALICIOUS

PDF

88.6 KB Created: 2021-07-22 05:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8b5b952bf689310122504ac4639dddf8 SHA-1: 2bff0b53087b0fb4489cd5c92420e7aebc72acb9 SHA-256: 6d3598cd24aa813557337cc871b42577f8ba12d2518dc4e1780bbd1a2e8f9638
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous external URLs, many pointing to compromised WordPress sites, indicating an attempt to host and distribute malicious content. The presence of PDF_URI_IP_LITERAL and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further suggests a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the download and execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/5boff0731c9qcgtoqsqn5af1lo/nodunafemomusowosagut.pdf In PDF document text
    • https://trouver-une-ssii.com/img/pics/files/kokusezotosotikux.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/xekibuwidose.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/08e0ef54e082e17b6c2d3df4b563506e/xebifumuropad.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c61b26f032e---giwasadelogi.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a2c1a0655---lobuvesumelikute.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/99449198787.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/k74b2bc96d15g3mo3g4jueefm7/85294111176.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/kutijiga.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/rebosejimijewezo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/7e8ae011652388861d0368594b6dedec/89755681562.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/25864157317.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/dosobolovelebotofife.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/doxuve.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/zuvagusuboganevuvoxewe.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cd493068a---99056917138.pdfPDF link annotation
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/49299e48b30685b6e1c1bc0174a4fde6/82994623285.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16076337f8863b---rojaxetanijux.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/litetoxopimutoxep.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160f466c1b2efd---22933765349.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/fopajozi.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/46050199626.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/dekozugigogazijo.pdfIn PDF document text
    • https://hssanesteban.cl/files/jutivaxopofivabe.pdfIn PDF document text
    • https://quaint-house.com/37292315553.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/49724189932.pdfIn PDF document text
    • http://chemicalengineers.ie/images/16362709505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=velocity+time+graph+for+a+moving+object+is+shown+in+the+figure+total+displacementPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 16724 bytes
SHA-256: 1b87e0d28101626712643727ce1b676f4a6c3a64357cfbe9729a00d93a11deb8
font_01_sfnt_off00011fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 11672 bytes
SHA-256: 4495fbd360acf2f69a3196150f5d07e36f50bd73716961d440f11a02090f90b5
font_02_sfnt_off00013b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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