Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7d6965d8c4d519…

MALICIOUS

PDF

79.5 KB Created: 2021-06-29 10:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 312e50e0f7a01285fb20ad13c81aa7e6 SHA-1: 95ea71f7c4571c95020a7ba9a9134d6b64d0e8ef SHA-256: 6d7d6965d8c4d5191916f6e9edcacd42591497fdcfa884e95630364dd694d83e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload storage and disposable hosting. These links likely serve to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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 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://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cdf19fa81---mofumobav.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ce9a9186ab9f8b240bba340f1e4b619e/felale.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f64692696---87962444174.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/d3d94ngvbs1i43n5nash62ldrq/jenigupixojo.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160982992254f6---gibazonodexafewikixuwole.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/watinejizesebatugon.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/46882045393.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/u1rgkvbq22j2krb0igh5nspe32/40790415892.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098f276f19a9---55554354603.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/gigox.pdfIn PDF document text
    • http://ahchala.com/img/file/fodaxapodurubikefazes.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/vuxopokijibazovekijo.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/3tjfkvul2e7mcdi6fiiehdcaq1/vudewajuleraguwipi.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/6457057bdde60d08e346efd9c6b4cd47/99830381609.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ec482c11b64dc06fbb2106383311e791/fozatumo.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/8056351164.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072200973a81---wivunonumi.pdfIn PDF document text
    • http://alkanboya.com/files/file///48304747060.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/rixekovanumobudawifav.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c18dfce96f2---70325759148.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/e7kmu3o258tn0blbu4lb94o7dn/pebox.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca04eac59---wimobebevidovoge.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e16eb6389---44112494132.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d6342f36c0538a9774b7e039c2eec0ff/libanuxomitipid.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8246c76738---fatagudolowebuvovul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=rogue+regional+medical+center+phone+numberPDF 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_off0000cfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA3 17420 bytes
SHA-256: 5ff56ea429ee82bdd4add78d15c414d073f115053e87d1e755b9b387bc87f841
font_01_sfnt_off0000fd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD50 11076 bytes
SHA-256: f3c9d4b89151066feca6833f528cf0de8b6a0055db3311e159aeb5e1e25deb2c
font_02_sfnt_off00011676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1