Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f71c9336d11d2a6…

MALICIOUS

PDF

110.3 KB Created: 2021-06-27 23:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cab4c3f1c06bb247c5ee46484c82bded SHA-1: 133baca670e932fd46f4db74ca599f864a444202 SHA-256: 2f71c9336d11d2a6a41870981c0276b9850a59054733a144672c941574826f9e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple distinct hosts, many of which are compromised WordPress sites hosting other PDF files. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078c7b8eb6ab---mezalorizirobikevur.pdf
    • http://chocoenglish.com/_UploadFile/Images/file/23444503949.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/8c3eh1223ag1kf4vav8qjh4vbc/tebapinedujuximeroj.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ciu3cl3ifh2re7l9poqqak7fo4/gavulubevaxokidewogewu.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebf1dc6683---38806986718.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160805266a22fc---4999903303.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/8895627ba540c0b77f74bfc09d42c624/24375324571.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c74240104a---49600824423.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0248293c5c---xudum.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8091a80935b2fb0163734e695414c505/20216448556.pdf
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/63960042660.pdf
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/4f5975c53aff87753578fef7a40339f5/32594555204.pdf
    • http://weddingdiy.cc/uploadfiles/files/20210609_215058_4509.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082555f04991---tawiwotibovupajararuwod.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/50v591r0gg9de61dv5rfh185jl/xosonajofulujetosupef.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a06cc59d28---93387065445.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ab52f8fb202c78e76a1a30945c41e48d/neluduz.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9afae2c86---sizikugujuwago.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608377fa5c253---82682231509.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/4183f5a20ba86707b94db21723a59cfe/fudetagemiwixax.pdf
    • http://bkdesign.ee/userfiles/file/45896958270.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/utp7u4lkk8tt8deavdv97lki61/duzizenuvifow.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=does+sodium+have+a+high+melting+point
    • 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_off00014c46.bin
13e189c4b85c9594742996d84169b0a53ada18cdc1b258058339173a31d8da0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C46 10908 bytes
font_01_sfnt_off0001651e.bin
fe75a808497d9acd4614fbb5d8abe05326d24ab9a18e493c0f414c0c80fffdb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1651E 17812 bytes
font_02_sfnt_off000193ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x193EF 16792 bytes

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