Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11c3a8762e36ceb…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 02:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 75e82894b1d66878c83434aa2e30030a SHA-1: 00b21fd306027edae837ae7b74ed62553997a851 SHA-256: f11c3a8762e36ceb8528a487c50292b609329c6c1e07bbee733fa26a5ec93aab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. The embedded JavaScript and numerous external URIs, many hosted on compromised or disposable domains, suggest an attempt to lure users to external sites. The primary purpose appears to be directing users to potentially harmful content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=best+cricket+games+apps+for+android PDF link annotation
    • https://millinerandassoc.com/files/file/32024278755.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5f009bc61923525ee0dd786084909824/xetuvodiwobenumupi.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f08eec07ba---puwivopujesopatinowewa.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/sutizamunovekem.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/792533295.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16130abcdaf8f7---wirujudeb.pdfIn PDF document text
    • http://immopolignano.lu/images/27185724534.pdfIn PDF document text
    • http://konberdbio.com/upload/files/zamividawad.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/lewejazonakapogajirufabis.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/wimopasetexepituvibupili.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/70260464246.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/22925796920.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/85325768022.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/jenuwa.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/rekazimexaxinizolade.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/25222400008.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/nekeji.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/22298242878.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/60451728163.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/36833322699.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/86370970452.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/89333058135.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/faxovuxasawabatesakik.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/64246950103.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/jebekipevobufemoluzaz.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_off0000dfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 18220 bytes
SHA-256: 320480e0e76184f41db2727e001599ffc6cf51aecc1ca64a5d2f534d7dfa5c9d
font_02_sfnt_off000126d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D5 11064 bytes
SHA-256: 1165283e55e70be847803d18d74695752e0ea8ea53c717d17e1ad0a859011af7

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