Malicious PDF — malware analysis report

Static analysis result for SHA-256 db116e0d118593cf…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 10:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b5297b5bdbbcba9e14682d321874d34 SHA-1: 77d022af81b5244ab7feea2833b578c25382524f SHA-256: db116e0d118593cf2ef92f988d8f545f4f34dc7f0ccff879d7d5e798548cc7ab
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The document body is heavily obfuscated and appears to be non-readable content, further suggesting a malicious purpose rather than legitimate document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d484cee44ccd44d699bfdc08a544dd5/xefisolorurupofadujop.pdf In PDF document text
    • https://dom4m.de/userfiles/files/12774465581.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/dozirubirakekodab.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/fisatutaxalepikapobika.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a80daabab4---73524898481.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/70261297250.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/pafal.pdfIn PDF document text
    • http://candientushinko.com/images/file/tekemexojexaxagajefamupux.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/xawiguwazonukaduxoke.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-5/20210605110953770664.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/d6fe5f0e825cee6a3cfb1087018f4904/dodubifawitaxovize.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/99440708367.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/78292563850.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/komakiveki.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/60896995732.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/48590781288.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/dfdf251ee89276740d1b1e8a15147242/nasedamilujapamano.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e638e2bed91---sawobovubudasabuwosidavuw.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/lmklegses5mg72dgdil32assih/69976773168.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/kasuzinajudifekateruza.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/jiwoforulumitodob.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/bitugumarafowemivafedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=namaz+padhne+ka+sahi+tarika+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94C 20804 bytes
SHA-256: 4bf76b615e1df1afdc3523eb1a0d7ad854205caaa7d3ea19a936a2e33b20346e
font_02_sfnt_off00010ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA9 10724 bytes
SHA-256: c53bb4dfd1c9c6b0952cf86b1b56d630ff6cd08ef8d665a719c25c0e1031f0d9
font_03_sfnt_off00012719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12719 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5

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