Malicious PDF — malware analysis report

Static analysis result for SHA-256 26488b86a8d089dd…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 20:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3190ed1c36b39a2a5c7731bbd6abda2d SHA-1: 323305886ba2307972a31421923634414e235977 SHA-256: 26488b86a8d089dd7c61f60c5aa871557680e260a6cdb077eaff19d9ec4bf8f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that lead to compromised CMS uploads or disposable hosting, likely to distribute further malicious content or phish users. The presence of external URIs and link farm characteristics strongly suggests an attempt to lure users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://damsindia.org/admin/uploads/file/niberekorezanaf.pdf In PDF document text
    • http://music-summer-courses.eu/upload/files/zelididurubapasu.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/xegako.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/xiferez.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/xojusazoled.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/lapejogefukubob.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/mibuf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335430ab5e4---lekaduwugunotipovotefuj.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/83220341561.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/detajibaxutinekusobosizop.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/330b96cb0b5b8151e3cda62f9018b6c8/nowozepibexuzidamop.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/nuvadimular.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/1874854297.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/jusumogetumulivaxosamidu.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/kukegibedan.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/71052563013.pdfIn PDF document text
    • https://songhong.info/userfiles/file/106378923.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/gubutorisikeguwizejeme.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/4042046052.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/pigesisokivi.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/34933491823.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/99f4def5ab81b31b5bd1b1b7ead3dffa/86048952480.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/vanixakiwumanokeru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=vmix+pro+apk+download+freePDF 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_off0000cfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAA 10640 bytes
SHA-256: 99cecf0f55c49977550aa7598d9226c3fe6302fb7c9d7452b97940dfc8faf116
font_01_sfnt_off0000e7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F8 18184 bytes
SHA-256: 743328170c7d9b37d690a71cc6b7b7f748094ea0b63649f49003686bfab62ff6
font_02_sfnt_off0001177b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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