Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3fcbeb13573cdd…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 23:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 05c19360e9756a905a81bfce2f4764f7 SHA-1: adec8548546f3083661b722ecd21830f7374d97a SHA-256: bf3fcbeb13573cdd2a75899494fefa9536d9f580d84e41a1ce11523c45f60f5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users. Heuristics suggest this is a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.pattyn360.com/upload/forum/files/39248020621.pdf In PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/5e03d51b2663a0c528af839de3c4d920/boditoriwowab.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/54076540063.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ed9f08ac3540833d894da307567a0998/69088026924.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b78f401d0a---19143618981.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/56094288069.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/68620118228.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/63092549592.pdfIn PDF document text
    • http://megaeventoa100.com/clients/f/fa/fa03970f5feff24be7017758158681b9/File/sarosogefubepadobumokit.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/6427431a070569c5d723874a4dff1a37/sivepiramexozanowu.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/36998939837.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/14567958533.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/69092524330.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/jomapugis.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/44333761648.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/bibepozukatuwebulejiwinam.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/92552793189.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/7801067721.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/memelibonuluvadezogato.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/33261990548.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/pidulamagom.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a0ad61cae29696ac66dc06895df20b30/83594225956.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ef6775325---zemisetexe.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/161027cf8a9958---vorezufagosivigojutobuvu.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/nedojexubajofususimab.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076bca69623a---japozanajarabavepotaxopib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=human+anatomy+and+medical+terminology+pdfPDF 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_off0000e0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 11000 bytes
SHA-256: 529057faec4b1d87d2e42a75fafc44aa1b54900d37c39002cc68975f9fe7b262
font_02_sfnt_off0001120f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120F 16828 bytes
SHA-256: b45bc4f15415c0c6338d2ad2e0b76ef8f6c7703122890180c4c0c94f95005a9f