Malicious PDF — malware analysis report

Static analysis result for SHA-256 9927a60afcf5f333…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 10:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e5aee6d3260eee90bbb36970ad12f513 SHA-1: 9500873aec6edbb1f1f1ceb574fb09d78c726d88 SHA-256: 9927a60afcf5f33397a9fe4786e84b7785ddb7611ca75d9c16f34e7e072e8922
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The PDF structure itself is a link farm, designed to redirect users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://dgkno.cn/upload/lavujupelisojobafabumi.pdf In PDF document text
    • http://asbu.net/uploads/FCK_files/file/59916759223.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/kutem.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/4275740266.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/roroxezebisaw.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/47346747262.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130d88deec0b---nipotedeluxoje.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/xazezijosakevivejeka.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210913103228_bXVrdWZ1anVudWJ1.pdfIn PDF document text
    • http://e-sportis.com/images/upload/34426244454.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc8d02210---metuwibuwotedenavulo.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/torori.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/xaxenefemidezotimav.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/figiribupewileraje.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/duriseterasuwug.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390a3b3c2e4---wititijexekolusetiwavejed.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/80086364864.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/43043634029.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/78295631246.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210907115548.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/27765815763.pdfIn PDF document text
    • http://anindecor.pl/files/file/6596772985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=project+qt+modPDF 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_off0000d5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 16960 bytes
SHA-256: 059d50e0587d53bd77121661f8a941a5baa9f49e7d1974fd0f112d72dacb3014
font_02_sfnt_off00011a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 10236 bytes
SHA-256: 09f72253b2c2e6b6f0d1c2fcd120b675e28201d0398d85bf285038e1ed7f76b8