Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5261f6a24d90585…

MALICIOUS

PDF

611.6 KB Created: 2021-07-05 11:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4e6614324cab9ea48604df3ed1ea7f46 SHA-1: a919caa41b57b8ec471efdbb5dbd3b1c854638f8 SHA-256: b5261f6a24d905850b5d7054f0792127b0208138ef4cdb53ea123f3b706a2ea4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The presence of multiple URLs, including one identified as an SEO redirector for free downloads, suggests a lure to trick users into downloading further malicious content. The document body was unreadable, but the heuristics strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7114

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://drafthe.ru/uplcv?utm_term=pre+independence+indian+english+poetry PDF link annotation
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05c0112857---kobesenex.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/e510heb0tat1m44qfk9v123f3r/53246633114.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aeace81e6---levifotadutuzeze.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/19343015122.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe3121c21---64559125596.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/39590810208.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61572402cb---zafefexabipe.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/4536958224.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/97000370705.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/b198f189059012a3c8a27367a15385e2/2364076633.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/758ef72b65069e45dd574590a2e849ea/22100722998.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/4458907c4c7572414f7201fad2ebd5c4/90987654389.pdfIn PDF document text
    • http://quaint-house.com/56614804476.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/2td5savcfe16ug7d0u2dnctgfv/84871890800.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/9rphjmmoaf415eomspkqichpf6/kabetimiginigid.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d352d9190---jagekoxizefulumefowiboje.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/wasosojodenedanaxazaleniw.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e3920a780---19944949614.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4e3c5a56e---16841356275.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021053019185273499.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85483ef65d---dopeziwinulan.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/9b7b0f276f2c5fceafc8370154837bdf/palilivovewatipero.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/42967587499.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d8c067e40---87287782702.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0009097d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9097D 17484 bytes
SHA-256: e933ce5edff3564a6942472f4694ab357e07b33c6de339f4223baf9f4cc443aa
font_01_sfnt_off000936d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x936D1 10908 bytes
SHA-256: 7f76f11bda7e9f8f5026ca634d939086de2c20a392b185aa378adae5c2617ee8
font_02_sfnt_off00094fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94FCB 16084 bytes
SHA-256: 60e59e701608a08463d5b80eeb63078ed3bb5b9c42262fbabdebabc3f6b258bd
font_03_sfnt_off00096500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1