Malicious PDF — malware analysis report

Static analysis result for SHA-256 b615c119f5eb98f9…

MALICIOUS

PDF

77.2 KB Created: 2021-09-18 07:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ed703cced8daf52dfd5240db699568e SHA-1: 978e8ef899633ae9e1c73e2ecbffcae6bb2c36fa SHA-256: b615c119f5eb98f96b237d8baae5755ce02491064760f01f162c534b21f4ecb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, many hosted on compromised WordPress sites. These URLs likely serve as phishing lures or download sites for further payloads.

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 https://oniceh.ru/uplcv?utm_term=the+big+hit+apk PDF link annotation
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133990c6bd71---44595821756.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/mosarofopexununodewu.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/kemujazufakegabixizusef.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/62104600635.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/37094304942.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/jozasanamebat.pdfIn PDF document text
    • https://j26clean.com/upload/files/72894871025.pdfIn PDF document text
    • http://lovesenergy.com/file/togime.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af56c83845---xikilam.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/5ndpphg7f2uu3b5gf85d2fbts1/mikuxipatijekikedowaxa.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/pavagopedivo.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/vebezotivox.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/abb3c8deb610cc63558ec2ad27798fe3/6488267679.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/kisip.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353fdb4ad0b---xadakazozamataxolumu.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/nofawebukovoju.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/doxuturamevota.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/kiwesup.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/80725822049.pdfIn PDF document text
    • https://mmtours.si/uploads/gabaturufosawoka.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/90875242092.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/39741340663.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/wavugupibetoturadida.pdfIn PDF document text
    • 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_off0000c61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 19268 bytes
SHA-256: ed49609875a92d680599f2a3483a7a1fdd829491e8a087b688fba9008c1b05d5
font_02_sfnt_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 10188 bytes
SHA-256: 8c3423debf7ef70ccdb021e23e5c7d10826313165a98c5bfb55d073d46febd16