Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb18bcec77d5341…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 07:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7038afbf3b8edd3523b1bec1c1c9f645 SHA-1: a1996216d906e2ed48a80f9faed2b3b4c185602d SHA-256: adb18bcec77d53412b1dd48acc8ca4f70fa3cb5cc1e6f33738bfc50a9a380e44
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

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://fisheaglesafaris.net/pics/user/file/64009874619.pdf In PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/rijib.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/8913da6099e096c29188ef51b1dfb5f1/fevuvedez.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/bedanowevijafikige.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/zemel.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/vazaxovifukajuboxam.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/gafuvipumabojozubulinapaz.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/kaladawisogosuzaf.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/80805909959.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/wajefugeb.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161407f8bd8e45---96077929264.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/12699935189.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/kelixebonesonupiwedog.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/8051654096.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/bosm9r24dao8k09106psauiern/60189914018.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/lazevorova.pdfIn PDF document text
    • https://ever-progress.com/upload/files/visaterixivikiti.pdfIn PDF document text
    • http://whatdwellswithin.com/file/68308148167.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/40612447989.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/24087034190.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/d9189ebee952d01496d46a3fefdee4e7/zoxonaj.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/zixirawupowevopujuv.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/sokuzobevubim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=wsop+poker+mod+apkPDF 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_off0000db4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 10300 bytes
SHA-256: 950ea8aa3582da8045ead32581ed513311bd5ed4316ad116a2387ed48d9d4f75
font_01_sfnt_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 18188 bytes
SHA-256: 6bde32e5b59a321ebdaa5264a81d1958f8ed3b24cb153acf1be4900e69315836
font_02_sfnt_off000121d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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