Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b55b69173bc5fef…

MALICIOUS

PDF

96.9 KB Created: 2021-07-13 23:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30adda8eee1bbe2f39d6863700deb64e SHA-1: 8e5747c8b0274f6f488d3f1315a9aaa0aba6c41e SHA-256: 1b55b69173bc5fef34069eac99f7bd4e85e39a448ee87a287e91a2feb44af562
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the final destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://medvor.ru/uplcv?utm_term=let+reviewer+2020+pdf+with+answers PDF link annotation
    • https://rubyyadav.com/nbloom/fckuploads/file/fekale.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/60309447868.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae1ee83c6b---94879037601.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/kc4q1canct7ic9j8mq705n16q4/mepit.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/68964080440.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/lisexipe.pdfIn PDF document text
    • http://dongxuyen.org/upload/files/19540435619.pdfIn PDF document text
    • http://hondaotohaiphong.vn/upload/files/vewironirefelifedovotilo.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/s9e1gs3o9ooo13keeqd9bb2s8e/60587349865.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/rukazuneziraxinolixanujaw.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceac494524---54519372282.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d52d7073973---fijoxurujefavigogaxir.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ed59215b0---85844283592.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/zewefuvevosovikagikijan.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/16219635868.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cb165cd62---84222041657.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/3b7606f6f7760d73f62ee4cb81667ecb/34044087032.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/8d317dc6559a91b01514fedab8cf9b11/70690701990.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2afb35b2b---93537812470.pdfPDF link annotation
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f666dd494e69437f24dac0092de8d6cf/3655876410.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/kojawazobezovazejunu.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/77250528446.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/5b5e767d963bb16757e1db18e735048f/21329726832.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_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 10780 bytes
SHA-256: f7bce51af43f83b0e01cda20d78e2f4a5c6ed9fbd7c55ca21f0fd38e28ae23a1
font_01_sfnt_off00011990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11990 16860 bytes
SHA-256: 2375a5bf03f5d369027548eabcf70b6656bddf3ff7d15275ad1da74f9baf08d1
font_02_sfnt_off000130d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D6 17156 bytes
SHA-256: f9b6416e5b7c0034491b25228511e4e3ff63d7f0351b6e3c7ab08b87ea947b93
font_03_sfnt_off00015da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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