Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad647abcdb6b8893…

MALICIOUS

PDF

75.5 KB Created: 2021-09-05 13:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1048064b1db988ecc616e56ee6fd3cd SHA-1: e07457c347196048172d6184b82c535d64192a0f SHA-256: ad647abcdb6b8893b5f528a7c588a45483ec1c82be7a2cd4b5dfff0f93b4f2f4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains. Heuristics indicate this is a link farm, likely intended to lure users to malicious sites for phishing or malware downloads. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://hagelkonzept.de/userfiles/file/sabutexebilasi.pdf In PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/fa6f89b98438e8723aa3035abf61a246/muniji.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/d435d45f6a29bfd33c923c6f661c4ff2/57578308527.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210823165907.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/52314708510.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/5254219910.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/18842904026.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/zibilovosoke.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/letuxorofara.pdfIn PDF document text
    • https://hirurgija.me//files/ruzepemilolirajuwo.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4d4b26142a6036a1eaf81ab3110ab70f/tifaguvar.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/gifezimeverodoximon.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/1707qv15jdj6k2bq6pcqa7b691/mafewenabitobaxi.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/26435804835.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/jibalal.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/xezovutiwilelumibizukafu.pdfIn PDF document text
    • https://termocasasrl.com/file/rifizebuzokosevutuwasa.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d23a46c7---bezenazur.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608595fb51b7b---28260108424.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f4c9a27b1---wufedogixatis.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/8e943f4937e94d8b88afd8f179a52797/8179853978.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/u3nq86kqoe5cuf4apjqcvgnrkr/58735815545.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/56286753146.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086144a7acc2---bixurutuwafusit.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/sqbgermlj61n4n6cu70or542u0/24629403898.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc680b1fd4---luxuduxufetokekepuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=traduccion+y+pronunciacion+de+palabras+en+ingles+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_off0000bf84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF84 11012 bytes
SHA-256: e504ffb17468fac0eea192730481e0680c5a5476e3c3ca677fa39189decec3c5
font_01_sfnt_off0000d8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 18672 bytes
SHA-256: 6f265838589808aa208d64284564e7bae0baa7c332e6d9594c5a08b6f5ec7125
font_02_sfnt_off000107bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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