Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbc9aa2d79b63f5…

MALICIOUS

PDF

92.4 KB Created: 2021-09-07 11:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 198d9a10919092dcabea0318ad1b28ef SHA-1: 5c50b0d04ce18488b8326897dbb10e75584b13c4 SHA-256: fbbc9aa2d79b63f5621b4e6c7839fbb4cff840683a8cedb685b005ad5b2b5af6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://chcial.ru/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D9%83%D8%AA%D8%A8+%D9%81%D9%8A+%D8%B9%D9%84%D9%85+%D8%A7%D9%84%D9%86%D9%81%D8%B3+%D8%A7%D9%84%D9%86%D9%85%D9%88+pdf PDF link annotation
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ap27o4b3a4ccvcki7t56rldv41/42476491211.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/85345519444.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/nosilaxalaker.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/60368783572.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/xizesekibufafu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/50515925629.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/relivolofox.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/rixipoxexivepi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tk3d9cc0lg0ah1kkqee1cc39h2/fuvaraw.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072218c664b5---xuniripilosapok.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/8143671088.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa881a9b071---44292665710.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/golug.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/9699559116.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607128708217a---53563439379.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608117ac1f8ce---60038212989.pdfIn PDF document text
    • http://chieucoingason.vn/files/41507312649.pdfIn PDF document text
    • http://moristas.com/userfiles/files/40328753648.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774b9b6a5ce---58339547267.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/wagenegilinoxol.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/88284318897.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/29144680228.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/415f3ad3b904707d04d8a59920b37668/xubebiwojeburitugavef.pdfIn PDF document text
    • http://yuqiaohome.com/uploads//files/202107300036487060.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000cdf5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCDF5 25708 bytes
SHA-256: cd1792a470d282babad10085ee2efee94eb77915b4449d657cecc351599ea444
font_01_sfnt_off0000fbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 19220 bytes
SHA-256: d5524494dfd1031ec5846590d896f28424e56d54574a7b38f44fa0ce19de8728
font_02_sfnt_off00012d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1D 19204 bytes
SHA-256: 0f55cd7fdcbd73b80cb8198709a6038eab8e37f8b0ac4a91e587e778b6f6b3a1
font_03_sfnt_off00014d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D11 9372 bytes
SHA-256: ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724

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