Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3b626bd6b2c825…

MALICIOUS

PDF

93.6 KB Created: 2021-07-26 07:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4e930f9792006b309563e9b4ed1d7f5c SHA-1: a50af20f615c6959feb72c31b9ba7582a65a0df9 SHA-256: 8a3b626bd6b2c825032c78447f721429992701738498f2bed290b21e1ed0dd87
184 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple links to external resources, many hosted on compromised WordPress sites. The 'SE_ENABLE_LURE' heuristic indicates the document likely prompts the user to enable macros or editing, a common tactic for malware droppers. The embedded JavaScript and link farm suggest an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5ae3e3fe3---wojoxolabedajuta.pdf In PDF document text
    • http://highgaincomposites.com/img/file/2021719145250.pdfIn PDF document text
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/38533316944.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe9ce35824---vodunatedifevevesedig.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/zifegi.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a96e8b1c95---31452640451.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50000d556f---lelivumox.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/sugumajotezufafijox.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/8921745753.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c442893a0e---nogegunowekuwiruvufakaxiv.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7645d80c40---63909125226.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021052123121573499.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ebd74309a01ad243a8dbed479b889f56/buzusanozubogis.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/40355694770.pdfIn PDF document text
    • https://ultralloy.net/upload/files/fenatuxoserepoj.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/84278355683.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4eb44688d---juwofakevo.pdfIn PDF document text
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/bevofidod.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/tizuwifotutefe.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160baffabb03ec---gikimojak.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/kibabegazemosatuje.pdfIn PDF document text
    • http://aurora-c.jp/files/files/labukexiwexukulogajoni.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/nudavulasox.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/4837163782.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ce2b4715614c77dc1d1a45ab4801fa4d/95686978081.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/2b0fc681cab786d36973bc9ef04da116/nowoputixokemazowebavin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=staples+binder+label+templatePDF 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_off00010caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C1 10648 bytes
SHA-256: 5d8f976cbfe9d8aae17ffa74644ec23ac7a5b9c89079cff8759b8b26f1e4295a
font_02_sfnt_off00013cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD3 16724 bytes
SHA-256: 08de96d9edfe01cde11187f22638a5825f81d744d1bfc884162815558d8b8d92