Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5feaf41ad52cc36…

MALICIOUS

PDF

80.9 KB Created: 2021-06-30 15:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ea867d9a111b6840ab5af8043a695699 SHA-1: cd1ebbb0b99671df65a503988565b99c6606aad2 SHA-256: d5feaf41ad52cc365ed549c02f4c89ac4f9eeb9b59e3e5f3c41a9abaf7391355
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. This suggests the PDF's primary function is to redirect users to external sites, likely for phishing or to download further malicious content.

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://xaydunghoangthanh.com/img_duhoc/files/47614921931.pdf In PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/xosajaroxefanetugerur.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/jiremifara.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/a14b4db644b5b4d10c00450fe83ef93b/juxugolibubotalof.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/2932792969.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/8qdi8v0kasljg63oq1v96nq4t7/nobedevubix.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/voxukevatunetenuvot.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/kujelapejebuten.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c35a713732cd4f050a2bb7a9359a4e0/72780636084.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a8f2694cb---rewozovalilikovekuxerefe.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095b50667342---rudalemetevozafe.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ade37d03df---dadulodagure.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/88363206685.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/milokef.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/0djhm7i7fr4m0qiej7bpagagrk/fenolejafe.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///42878864560.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607444b973ad2---762319899.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/xonexedanebonigagis.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/26600846415.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5799c1b214de6b7d20e69d49cfd81c88/5397605159.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825ad28051c---pikufaxajatotel.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/4f1db4d1ed54a4e8b8dadc7e0c2c77e7/sikiluwevasemotalu.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/d66095f7eb3d4622127a2cacdf980576/3003394820.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/wunofifevom.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cbb164afa---tawutemuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=dough+and+grocerPDF 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_off0000d865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD865 17872 bytes
SHA-256: 156116121275fe692c95053bfa20c6a9097d986fb3e833b23b69675a9a8ae252
font_01_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 10344 bytes
SHA-256: 10c059b909c1084bf0eb14ca0eb052bc81fa839dd17d50c7ee6cec8437263b26
font_02_sfnt_off00011e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1