Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9311d3d1fae210…

MALICIOUS

PDF

83.2 KB Created: 2021-07-10 13:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85ce129c9e8c3af6e39a6f4d0564ece0 SHA-1: 7350cd5e89d0318f5356395cd39bc72361f8eb26 SHA-256: 9a9311d3d1fae210149cdfe751b92eddb58e95dcd723aaebc577d924a7763568
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Numerous external URLs were extracted, many pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=in+the+early+morning+rain+cadence
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8fac8a53d---zawadaxiruxukobinotam.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e5e9dc8fc5e585d18be0bf97e139a326/kukemegunolikuj.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160cde2048c4ec---87959804454.pdf
    • https://zivotzaokny.eu/res/file/woravenuvulajumafa.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9446cb96dc033c1f2f28ec527c1c07df/fuvedigibutezo.pdf
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/pufavalafekojezepewomawe.pdf
    • http://artospace.com/pics/file/54683479963.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be3d62644a6---38973832167.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742bbb54bbd---rifepubikukumokifutegaxa.pdf
    • http://mitsubishilongbien.vn/images/ckeditor/files/lafuvupurezegajupesagu.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/973db716c2a0a4c2dc26e9a8a679f5f1/gixavijifumebev.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ce9552d0d---dirurevufogas.pdf
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/12198445902.pdf
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/91795492005.pdf
    • http://aromaonly1.com/yamituki-n/uploads/files/vibafufeteneru.pdf
    • http://komputerzagrosze.pl/userfiles/file/12038333700.pdf
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/pesavas.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/86498672027.pdf
    • https://diedacorporation.net/freesiafiles/file/fifel.pdf
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/98174181597.pdf
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/0711c1eacd3ed42fea55e6af2fd37273/71272184808.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/6b964f0dd22f27b1dbf4049f8b5f3e12/jufaxudogepi.pdf
    • https://inncredel.com/uploads/lemafuroledijetozolen.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e69f2faddb0a005fddbc42da26b03c2c/89499068770.pdf
    • 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_off0000e293.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE293 16792 bytes
font_01_sfnt_off0000faaa.bin
c1764a8e0b40168be5acb3967c0da7db36c7a2c3b265f3ce68ebb4071b098c74
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 10712 bytes
font_02_sfnt_off000112d7.bin
d9e5879f4f2b6084836023c89907708f228f5d53ea765880ce06ee7f1c45d0d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x112D7 17056 bytes