Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab02f4e72cdd87c…

MALICIOUS

PDF

77.7 KB Created: 2021-09-19 20:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1575b07a248b4dd85a48f1a8fe8f2e47 SHA-1: 5dd21b354b7a891a8c824b78e812480e987c68c0 SHA-256: 0ab02f4e72cdd87c762154997d735c615f161c71b6f66052936db701cb2b6d63
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malware. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final malicious destination. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://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