Malicious PDF — malware analysis report

Static analysis result for SHA-256 9abd88428ad0b41b…

MALICIOUS

PDF

73.0 KB Created: 2021-09-26 18:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f15c8ade45eb5836b93012c14eb1d20c SHA-1: 56be852e71d946acf789d79b5f713283081e7fa3 SHA-256: 9abd88428ad0b41b8898b65b8447f7d7f3335b056ae568bdbf34300884460117
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. No scripts were extracted, but the structure suggests it's intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hamasataccessories.com/userfiles/files/jakezubewazomulanetokof.pdf In PDF document text
    • http://smeeing.com/userfiles/files/vudukidikoridisuw.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/nelawugo.pdfIn PDF document text
    • http://topp.pl/_topp/file/gijilarifid.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210920_033417.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/54092495873.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/36108312094.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161449f5d39b44---gavisiludova.pdfIn PDF document text
    • http://sushibelovo.ru/files/retofuxejoja.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/fejaxadokomejizijuvagep.pdfIn PDF document text
    • http://alidongdong.coco1490.com/upload/file_folder/file/xewigukufedakusis.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346a630d987---wuwajeva.pdfIn PDF document text
    • https://atlantidegattico.it/file/bupudiwidalu.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/lilekipudugemelatuz.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/36069696705.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/89863577752.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109032038081721.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/42306380801.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/11745389058.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/xajulimexaxoxibu.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8771e01fc---24199926985.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/92238822391.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/zinamiliwugedapupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ppsspp+ben+10+gamePDF 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_off0000b69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69E 18604 bytes
SHA-256: 52fc13e08ba9f8b42f335060375197df4d129ec103e11d863747314401544446
font_01_sfnt_off0000e6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED0 10452 bytes
SHA-256: fcb23ee9848e8ef46f0ffbff928c694a1e2ea9b0f669054c7b346a5e813511b2