Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde9ca5381df2c86…

MALICIOUS

PDF

83.0 KB Created: 2021-09-03 13:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 648200840eb744398e16bd98be0c304b SHA-1: 3472cb16d0617592528a880ababf62ca2116cd19 SHA-256: fde9ca5381df2c8634f838392f682d7564cccc84316224fbd0dc971e1493b60d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits multiple indicators of malicious activity, including links to compromised WordPress uploads and algorithmically generated URLs. The presence of numerous external URIs and link farms suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://crysiq.ru/uplcv?utm_term=descargar+certificado+antecedentes+judiciales+pdf PDF link annotation
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/f24177931d34fb87fcc9fd6735309919/38025661031.pdfIn PDF document text
    • https://badoza.net/userfiles/file/jiporan.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a36b9ae5a---23555579325.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/kisununida.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/61848490786.pdfIn PDF document text
    • http://grandfiltr.com/files/file/20087699990.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/18167559990.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/5628a765456e50e3c50dc994fbfa8d6c/6563275946.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/95480813530.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a2a7b034a---36350534087.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/76588297033.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbaea3f2ef3---ragepoxaxipugugagifezedi.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/tukojut.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f1c9117b87560eb8d98ad6076a2d8eb6/62454261616.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/fibopefijetelamige.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021070219358_918501460.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/tufisedupikakowumewomurik.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/62647911084.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/7fa9fa58feba50222b6ff040831de44c/tolavigexijimaxaminolere.pdfIn PDF document text
    • 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_off0000dad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD4 18924 bytes
SHA-256: 83300cee1905c32e7e1928fe9b5463c4fc5cd32bdb77139782463fb6d395c487
font_01_sfnt_off00010b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B28 11024 bytes
SHA-256: a8ebf587a814dc30e6ca945ef843d87e8685a9ff799e2e6f5f25cb88fde94583
font_02_sfnt_off000124b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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