Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c61720227b7f782…

MALICIOUS

PDF

80.3 KB Created: 2021-09-12 20:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 387bc0ce10a014d84c9bb0f9f08418e9 SHA-1: 99de967bd6bf7789a2dda7f30827104e288148ef SHA-256: 1c61720227b7f7824761b0be7412f082248020244351bdc5048bbbab4bca179c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of numerous external URIs suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://klubalfa.org/img/userfiles/file/17559643577.pdf In PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/1717394542.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/xikipizirodumijuzufegip.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/28550089331.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68855116085.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/27768276715.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16130dedb7bbf4---84712833046.pdfIn PDF document text
    • https://rajaunited.com/contents/files/lakeju.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/nodugodal.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/58754653984.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/muxirafuzijusixa.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/62b0bd39b4d3ebd4c8d93b8985cb5da9/topalivutipobizezoti.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/povevide.pdfIn PDF document text
    • http://kvrhousing.com/uploads/kukakegolu.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/wuxaranid.pdfIn PDF document text
    • http://schokofontaene.de/idata/kuvagenogolopalaxif.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/08195158300.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/85d09b6a7a92bd633335d0d13f018779/22072764931.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210909212218_2072661437.pdfIn PDF document text
    • http://dogable.de/userfiles/file/dabugerirorad.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/62981335797.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/razezub.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/xorapixovonab.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/80984856134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+studio+click+button+to+open+new+activityPDF 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_off0000d2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ead2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD2 11084 bytes
SHA-256: 2de8565a3cf970f5bc6d2cd73ac2290db1e86d64c7c6d000c3b00c5ee80b8d0e
font_02_sfnt_off000104b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B1 17836 bytes
SHA-256: 6e5a90f9d40c70632b14376400fe3057ff00a342efedf834ebca14541697fd6d

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