Malicious PDF — malware analysis report

Static analysis result for SHA-256 15dc32eb25e60684…

MALICIOUS

PDF

88.7 KB Created: 2021-09-05 06:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e934ed065be84a4272b95dc4158e3df SHA-1: b110bc0d285e6842dd5b6e67a24c2882328cf340 SHA-256: 15dc32eb25e60684edcf1aba830ca456a2ab66a698a643a1069019046087375a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. The presence of a 'download' button lure further supports a phishing or malware distribution attempt. ClamAV detection and ML classification confirm the malicious nature of the file, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=powerpoint+to+pdf+keep+video PDF link annotation
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3cv96j9l2g07pk4q2v65ah6elg/74298813356.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b180086c4bf---bujogapenaxobapediro.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a932e3bed19---13735977962.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/dulasinodi.pdfIn PDF document text
    • http://someteme.com/archivos/_20210627010030.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/jiremamaxosususotidanin.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f08bf6230a---lawudak.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/2280570373.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/85287027187.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/32fg2ejoalsdnt944kfb0e5mb3/fapulivabal.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/bovuk.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/d17687afecf11bca810aa33c4a931932/xojomi.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/xeronodanap.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c589dbb99---71172778454.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e26b68ca96---13561198726.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/77060358644.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f98193b85---bexorizijamijoxixekulux.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/1dbf89f73678d418bb8b70472188a5d2/69868107851.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2c719aa2e---lekepotax.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/dv9c4eklf6jlhu58eei95ckfr6/newezoda.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/55240772957.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/c31b689eee91071ce15c081abe3b150d/jaxekukalawom.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5751b39bbc9985508631d301484597ec/zasiroborusatuxu.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/pakamoveladofogibabigemek.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/bitafeveguburuxozanegome.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/28069603889.pdfIn PDF document text
    • https://airshow-bg.com/file/zetikafodawowixafibifex.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5mlk105aqadg3a496p68hcrkcl/mikagitezexoposarino.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_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 17088 bytes
SHA-256: 963a509d291f2b1e6978d87e63eda57803706d8e68598dd5a4884cbf9746fd3e
font_01_sfnt_off0001253f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D56 10360 bytes
SHA-256: 5b5e53b3674b179e735feff7eef12dd1e4c5ae27ec82e528442ec67f49d861e6

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