Malicious PDF — malware analysis report

Static analysis result for SHA-256 e80ba607f6962bd3…

MALICIOUS

PDF

75.3 KB Created: 2021-09-10 06:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a8c98d9df4411c727628c53b38bad070 SHA-1: 24a37e5a2261cf3dcde93d847d5c9d698b552258 SHA-256: e80ba607f6962bd333ad9ef3749c95f9d3b75b189828396956895060cd301842
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms or use disposable hosting. The presence of external URIs and the overall structure suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3852

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=win7+download+iso PDF link annotation
    • http://8njl.com/userfiles/files/87666227089.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/nibut.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/20663189947.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/gaxupezewixolepila.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/paredisakamumisavamarex.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab8e2790b5---24066386708.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/safavapobekofojiviwew.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/44844012943.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/raletufekipuxifijesar.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371a176669c---65917644399.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210901_051041_143.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/3805377878.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/8389395002.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/33365918750.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/47069534391.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/77487430267.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16138d77050c5c---sazuzijulofufofi.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/xeloriviwukekavujeri.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/kosodofisexaloronukiku.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/nuzumo.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/rutononotasuxodol.pdfIn PDF document text
    • http://raczcsalad.hu/files/91944584630.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/tujivumejopejovam.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/vavirubutu.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/tezebiwakoniladu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8C 18036 bytes
SHA-256: 1f731716ec885f4ee740d6cd82abf03da59a324f0ed40b8594d84905cfed7e05
font_01_sfnt_off0001094e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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