Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a0c51669b5bb07…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 08:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa44c0eb7242df6ba1087fe5c523a607 SHA-1: 1db39084553fe560129a0354d72e5981c098c0f7 SHA-256: 36a0c51669b5bb07967d8fffb9108240f29add02976b262162b9cb884198f1dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://smidgel.ru/uplcv?utm_term=the+thigh+gap+hack+pdf PDF link annotation
    • http://longvu.vn/Images_upload/files/rivok.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kaxuwapo.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/waguvazupar.pdfIn PDF document text
    • https://onlinendttraining.net/files/namilupak.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/digorajodinexu.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/xutetavezavutusiti.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/dizavosadoxifazab.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/zebetobozediserojegadab.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/fuguja.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/3fgu64b86acghk7fr3pdpjd758/jesoviko.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/xilusilefisawo.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/bazanoruviwifukewu.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/vonoxel.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085dac00fe53---nepojapuzuzububokekafiwek.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e231e61826a---tabomutuzazikuv.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a8dd6c14b9c010398aabf56e7a6e9497/zitoboguxi.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tadetumowevimimonavu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ece7b1df6c---60528356786.pdfIn PDF document text
    • http://yepuco.com/uploads/files/77654551498.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/55766655212.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d4ed347d7---nitifuzolitike.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861d27cfb2d---worizunonifi.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/161061838c4d2e---jatodunegepuwi.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/25091400218.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5def1ab6a---52591770009.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d221f736b72---likusexusu.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/mabogesekufulagurepi.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_off0000e83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 18576 bytes
SHA-256: 67bbcd4d64411b96249f3183f124681e13217fcd5d38e54b75ac8995a01d6caa
font_01_sfnt_off0001193c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13153 10416 bytes
SHA-256: ee3f1cbef56e777fda0de5bfe7fc0515cf1fc074fa91a98eac27fd1cde86700b