Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d460abe03cd734…

MALICIOUS

PDF

82.9 KB Created: 2021-06-25 21:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2af6fe2ede14d460000ea9dcdee1da57 SHA-1: ffe980a7fd03d016860ed2f9410453c5950fc47a SHA-256: a3d460abe03cd734dff93679e4e3a7c405f9c85ae081804474b24c92f351f576
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://panteres.com/files/files/220283262.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16079b58b76839---fixosokidifupija.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0174ad876---nakupevomubafewobevubin.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a51f7df24f7---34476694525.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/4e83a8fdc3377af25db654fa590fe2f8/jifukulisuzajidovok.pdf
    • http://chongros.com/userData/board/file/dojamemofetadaguwajizob.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944bd749087---51780769675.pdf
    • https://paperland.bg/uploads/file/suliluvekofakirez.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/1b56c626acf7a07a170cda1a8f2ad282/vuxogilivisetimupuxa.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780c6bd75c9---revorugidotafelitanogomed.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/632b8be8f663604b2c13c70e1d60e831/82260302333.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5fdcb45e5---tinopumotexuz.pdf
    • https://bluetact.com/locktactyuma/userfiles/file/bekonebigazodudagoxazugub.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc70f257a---genemivo.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084033ac868b---33320476541.pdf
    • http://usaoxin.com/userfiles/2021-6/file/54296855477.pdf
    • https://apsco.ly/userfiles/files/lixaxibelu.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/489ad19c6c0b5c15e615884242e750b5/49105411775.pdf
    • http://stalmost.pl/userfiles/file/80908963168.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba911e13db2---31340371746.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd7613c25e---61737423515.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=type+1+acromion+meaning
    • 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_off0000e38d.bin
b25c6d9c4e1e8c60466487d4a360a5851f482aed0c36b4acc985160fa8453600
pdf-font-stream PDF embedded font (sfnt) at offset 0xE38D 10532 bytes
font_01_sfnt_off0000fb96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 16792 bytes
font_02_sfnt_off000113a8.bin
ac6d577662b2e14a22d031b76a80a5dc91f5be49065d7c8aefb7edea97e03fed
pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 16484 bytes