Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ac800490b6af8e…

MALICIOUS

PDF

83.8 KB Created: 2021-08-23 13:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ca7f27316ec1d466edc8d186c0a2240c SHA-1: d5d323643754e123cf7eec38a27bacdef4031fa4 SHA-256: 27ac800490b6af8e04c0986b4e7856ab6fd2862c628e826fae2cfe1477f16cdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure victims to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://garglob.ru/uplcv?utm_term=pernicious+shakespeare+definition PDF link annotation
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/388c54e07566fc314bb476eaef0c8244/wepezitemuzimesa.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160945993869fb---jeroxexatepisuvekidinuvip.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/dixifasalakuri.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/70589342390.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/75f68a14f9218dbeaf746f770960523e/10637591687.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9118608f6---vasuwirubamejugilunupekam.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4b3863498---buritudeposejumamurin.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/78705125847.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/50631235740.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/politijinukoti.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/45340205826.pdfIn PDF document text
    • https://ocw.tw/uploads/files/5418806097.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/gijukasifufuzajuluripax.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///202106267834_844902640.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/rlj2mhhj5de6b1nt4hd1mvh5ok/nomizepinab.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dce044a342---11872123861.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/defuwidinekasogeseduxa.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/53668411508.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16249291443097.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/lurorijebejijavogi.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609670d503fc4---92613468595.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/40423200191.pdfIn PDF document text
    • https://scriptdd.com/_file/file/8152692944.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_off0000de7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 10864 bytes
SHA-256: eab56b69a760722552bc76da25e05d0d522d172b027bb42a43174afccea5cbcd
font_02_sfnt_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 18060 bytes
SHA-256: bddbc765c16533c920875318a8aa7537a956c11ac534284e84d79053b68c2fda

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