Malicious PDF — malware analysis report

Static analysis result for SHA-256 3423d4ad415b4014…

MALICIOUS

PDF

79.1 KB Created: 2021-09-15 20:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2c50144ec401ad17ea839fd3bb95a728 SHA-1: 15a09533e6038ce19c72001fc829efc263462bca SHA-256: 3423d4ad415b4014e9c532b3ae7ca54a0d4c453993d1e66811c080f9d56d1792
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links on disposable hosting, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=how+to+transfer+pc+to+android PDF link annotation
    • https://dawnraytech.985.tw/data/file/userfiles/files/mepekafufuduj.pdfIn PDF document text
    • https://siroyensao.com/upload/files/bisolifavuw.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/diduzidezobute.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab08baedd---burexotovobekobuzo.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/41490017455.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/baxokegutufugowivaj.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140494ab5f50---kuberofawawufim.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/11330897674.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/19746587161.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/wugofegupikuxebesokemu.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/94603620047.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/budupezap.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/63373388789.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/togifelopi.pdfIn PDF document text
    • http://kgmda.com/upload/files/61854910027.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/petatexanu.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/savepanikamesuvawer.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161371b83ab668---zutidiwopaxaxaliberij.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/60829605882.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/79007283348.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/11191603444.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318688c4b49---piwobevamewovikexe.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_off0000d282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 17392 bytes
SHA-256: dd644fb367f714c8b23158773f043f266920a8a305f8fbb11b24638da966a0f8
font_02_sfnt_off000116c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C4 10644 bytes
SHA-256: a4b60f516bd8fe51d39abc16ea3a9d146b4022d54ac3fbd558563c3b11e39d20

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