Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45d652a91e643ea…

MALICIOUS

PDF

95.2 KB Created: 2021-09-20 09:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e2327e0d11ec92cc01a304f4862d8e6c SHA-1: 98a65f855fb2b66c2644eb924771d7b4dc7dbee0 SHA-256: b45d652a91e643ea28bd4a5c60cabc7e44781d46db9a54572de7f19aac851f81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URIs and the overall structure point towards an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://coretry.ru/uplcv?utm_term=how+to+get+hbo+max+on+firestick+uk PDF link annotation
    • http://isspskola.lv/userfiles/files/xavokitokevekasilipokug.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/bakejavi.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/f27b0406588974c0bdcd2ee529d691c2/telurusatefefixiw.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc04088321---jojiximufodufakomugubi.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140d8630a008---wusuwamozepo.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/gexovarusege.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/nesomof.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/mibejefu.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/67907360147.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/65641141950.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613164290f5af---13739674787.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/xidobafifofexapiwodigazo.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/35760064487.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/5550327508.pdfIn PDF document text
    • https://ayurmitra.com/files/file/56095042830.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/ak3mmv9subv30e798nn7rb38gh/porumoduvepuvetawu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c35745f03c77a0b97f1d38276d2363e4/ludisugagavawolitotuvevun.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0b9ec8691---kotafup.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/84129058384.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/13434326320.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/jebegat.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/81558090803.pdfIn PDF document text
    • http://scpt.it/userfiles/files/mifazedekitogudorez.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/3efe72ab1545211907824f01d79faca5/36150614681.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/18966055863.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/rabanitufavudonu.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_off00010a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A17 19188 bytes
SHA-256: 9ec77d1cdf2c23d36f8cc6030c6ea4f1d6a25af698bf5599e90491088c5385fe
font_01_sfnt_off00013c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C41 11248 bytes
SHA-256: b0fc7b3dfb1bb96bd9ab98726c84feafcc5c1613c22105e693a2d88376b2bf9e
font_02_sfnt_off0001568c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1568C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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