Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef89491d124ba42…

MALICIOUS

PDF

86.4 KB Created: 2021-06-28 06:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 53e30ae90dc35e462cae7b424986173b SHA-1: 0ecb527a03dac24818e35e6b1b47a5286cdbe71d SHA-256: fef89491d124ba42cf66e69a97fa0f77475deb8f94b50e38738bf19ea96b7aa3
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of embedded URLs and the 'Fake invoice / payment lure' heuristic suggest the document is designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://queure.ru/uplcv?utm_term=california+workers+compensation+manual PDF link annotation
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160805939bec25---ribevetulefabuf.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/f69c577a05106bd7d15f10928751263f/gemuruviruf.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/segogetexitozesirafomifo.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073eba4ebde2---supomora.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/girarizusuzijikiziz.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb7d134b14---wadepepuvu.pdfIn PDF document text
    • http://nature-revive.org/files/file/96766690117.pdfIn PDF document text
    • https://banghenails.com/upload/file/lafaj.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/pujevogigexesuwokipekeg.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/n1ittmp9p250hmcbkah43enms6/narutesujunoxaviz.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d903fba5949---wiweto.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/150924ab2c036d7aed9a234969209084/5553648369.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/86788883213.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9713cb39dc88b0d7018eadd1b0fde09a/48397690120.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ea670902eb639630ab64512e5b8c96b7/18788891680.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/99511179168.pdfIn PDF document text
    • http://apsons.eu/files/file/madujizolezutawuzilina.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608929b5ca842---37924087417.pdfIn PDF document text
    • https://melz-feu.ru/upload/vuzisararafebivid.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/49618210798.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/govazapudunumalegonisirin.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16086a62346ba3---zokegizasavusopusat.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/361690cadb0d910e18a5016870967965/68333183263.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/gebuzid.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d4e0a0b6f---28913837878.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_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 10948 bytes
SHA-256: d8b4be326d6fca2b3706324dd9a51ce923fa1a09b8d46411aa16911eda6212b5
font_01_sfnt_off000106de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DE 16676 bytes
SHA-256: 560ca80c99955a8036fcb25527d5cb7f978d052a1aa3841c3c4e35b957332dc1
font_02_sfnt_off0001324d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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