Malicious PDF — malware analysis report

Static analysis result for SHA-256 be50ccbf22626d18…

MALICIOUS

PDF

77.3 KB Created: 2021-09-04 01:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8b817fa60cf731ec29e020380ba55372 SHA-1: dfd74f9a0a5d4f2439bb3d4c8bfd705ee825c21e SHA-256: be50ccbf22626d18eaefa22b6d4c71a81f8aeef9460dcffd80678c27724cbe45
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://miele-service-center.ru/uploads/files/19969936797.pdf In PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d476ac483ea5718c6b289f401474e782/25902751705.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/meminuvitimufitete.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/tokikifiw.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/pubuzokijurexoburi.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe685d01c0---zurijavinevademu.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/728be048d9fafdd5c7ed4cc7e758626d/puzidifunowemulixegise.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/59174019400.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/doguwubovibojo.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/70198435628.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/68346744188.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac55e18b26---13673411796.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/91495928777.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087120d9473a---62292313303.pdfIn PDF document text
    • https://angkagenap.com/contents//files/20686644060.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/4cece8d58f5bd7491f9294faebdbe5db/bineriwemuxas.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/wurizado.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/12745756397.pdfIn PDF document text
    • http://veejaytechnologies.com/userfiles/file/sogiwoxelurufivatefajap.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/73220483499.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/mojobosavexinutuk.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109040505143044.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/fowisetoxo.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/78202465859.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/lugirarevav.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/61039826844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=oxford+dictionary+of+english+etymology+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_off0000c960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC960 16888 bytes
SHA-256: 372b6f428b713cb261a89dbbed65b00e87dcd6d56c19246a39462219b2332abb
font_01_sfnt_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 11308 bytes
SHA-256: b011b740bd91459f72fd8ceab89e070e758af0be20f58d62b4ae42bf92048b8f

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