Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e54fe7c3953ba37…

MALICIOUS

PDF

76.4 KB Created: 2021-09-19 01:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0aa4240a691a8f2244ad653e6446d544 SHA-1: 7e8501181dd5bc507abc4904269d2627c9664b2b SHA-256: 9e54fe7c3953ba37cb4b2d53aab52cd7a05c5f3ead9fbf145640f650a3fca89c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. The PDF also contains numerous external URIs, many of which are hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=wps+pdf+to+excel+converter PDF link annotation
    • https://deniz-sogutma.org/img/userfiles/file/pekagozadavonol.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/35684568919.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/bisidiwogozo.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/51191441297.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/dalat.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/18796806350.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/hpn0uha4tk4do6fi1m8e1fkjj0/mejupilogudebo.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/pevorokujarodila.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/lalepibapuwuxewebinu.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/25219234872.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/77b5fdf4ef768d52c5b523d0e078f35e/xepobesabuvumujoziwi.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/8a1722e244f78830b2ca335b599a2009/75906373470.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/63150987090.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/94455945711.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/wedewoduxilovinedis.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/dojizet.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/nugures.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613512f5cbcac---18613287094.pdfIn PDF document text
    • https://mkontakt.com/dat/file/60110146095.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0d8014a9c---97051463303.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/26428437040.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/47081224453.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 17576 bytes
SHA-256: c35762f25e526bc735288bbf50a6b72e0c3f027a25c5bd98695782d9f99fc6bc
font_02_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 10520 bytes
SHA-256: b6652d0ef0c2b3d8f87a0f041d41ffa19bd86d0a938852945946bde75cda61e4

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