Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0c8945fee5f9e1…

MALICIOUS

PDF

85.9 KB Created: 2021-06-25 22:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5419c4ed42280189a444c9efed40c515 SHA-1: e7717a71c30147faf24fe5843c3daea08c053d36 SHA-256: 5b0c8945fee5f9e192e347272480706ae5e95dc82230d17f20f5654c7a6b6d3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The 'SE_INVOICE_LURE' heuristic suggests a phishing pretext. ClamAV and ML classifiers confirm the malicious nature of the PDF, likely intended to trick users into clicking links that lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607108c8e6729---31157273726.pdf In PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094426f075dd---faxopulopifosaxirorozoxe.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e1547d40032864ccf91d3367a52c415f/bumutuvariwilip.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/wetakodozokurijikuw.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/fc0676707ba0a259ffc8c6d53a82c3a9/puwurux.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/0923afbe1d47899830176973d86c3fb3/bajuzuj.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/24528857618.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc3196b5c---gusolanodavanuvava.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4eb606b70---pilavoseja.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/7c12300a6953a58567b69e4c36e9e059/xakepukufareleb.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/357d054dc74da941ab0c6d44fced6cb4/zetegowufelijigazixep.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ktt36bs2bbuborqlrqvpctn25o/tagowivolewezofikufapoti.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080e33eb0dce---40321761422.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1fb4e03a41b49f23a0b4494ecc058247/wusovivagopapejiliwun.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16207849203935.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/fiverejulimipunow.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16089e5d65a052---novojemezewamidegilav.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7581ecec91c381d60c6c28b8ff771ae6/12184557020.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210606162295026098.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160859fb7023dd---26498605975.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/xojoso.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/15993667157.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d4081f3183a291ec829d5f093f6ff92f/42591385404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=child+care+subsidy+balancing+2020PDF link annotation
    • 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_off0000ec02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 11056 bytes
SHA-256: 42319fccefeb0648a16e41670e771a16b59954a5539a5e86054e94810e9488ca
font_01_sfnt_off00010587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10587 17036 bytes
SHA-256: bf4952c2e82c3a613dc8044b2863d735b321ab31244fad07a6488e5a2846b130
font_02_sfnt_off0001322c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1