Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05b0e88dc8a769f…

MALICIOUS

PDF

85.3 KB Created: 2021-09-08 23:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 981293fc92c3f0dd3ca574701bb7e5fa SHA-1: 6e6be2757e21e6c99d7081705a4600e1c94675a6 SHA-256: f05b0e88dc8a769fa539d0174b0bf5d2df59ae6c9534ac057442dc7e88a23703
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://beauti-full.ru/uploads/files/76181704722.pdf In PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/54808543433.pdfIn PDF document text
    • http://vina2002.com/uploads/files/48947672730.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/45694489426.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/85757697542.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136348de0d85---bapipawobewox.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161358e3f3384e---51101427117.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362ca74f9d9---25453249215.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/1326294453.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613867f11ab81---43545803969.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/63809080007.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/59750975483.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/govavesekaxiwurekenorok.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b5f62df3b---tuberovuxixopukine.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/31127927119.pdfIn PDF document text
    • http://195exim.com/datas/files/vesoje.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/48436673265.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/zefutobedogoparuje.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/maweniwukugifi.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/28949238317.pdfIn PDF document text
    • http://identik.hu/editor_up/60554817896.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/82313215111.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/64405868975.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=biorhythm+app+for+androidPDF 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_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 10584 bytes
SHA-256: 5d5ee6865e17697e55e6c9b3e76cb0597e255a83a6c6f4ace33c1cafb5fc645a
font_01_sfnt_off000100a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B2 18056 bytes
SHA-256: a6e892d22bae6965c01b71e8633224693a71bf8cc6002f52b8080bff9a4b31c3

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