Malicious PDF — malware analysis report

Static analysis result for SHA-256 e750af7c54ffc13e…

MALICIOUS

PDF

87.8 KB Created: 2021-07-01 16:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 21863fc167ee4698b3e19b92a70a0dfc SHA-1: 19425206f81cefd75057789801cf1a7ba1d25613 SHA-256: e750af7c54ffc13e348c51bdda2177152cbe76a4fea975c3e30564e4a73cbbda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of embedded URLs and the nature of the linked domains support the classification as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=ba+1st+year+education+book+in+bengali PDF link annotation
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/vafebikis.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/75775716215.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/24c9a178da84f7f654f2edb95094bbbd/worewinijiwolemo.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/22485979989.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/ketugivifoforudi.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/18669542137.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f637a59d81---29750883721.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a14bb4b83---23417233644.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/xoxuluzobizitifazivuresuw.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99769565542.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/63793484091.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad73ea5d26---85954141202.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcaea14bf1---45424927237.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1619edb2c---54688475007.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/vuzujekunodutimeratediwo.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd7b3b4a0b---popuzepuguse.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/37127168912.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hfnss8qb9jgaf1nsv0176lhde2/dupalisewilanapafexufabe.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d27fdb994a7---42598225710.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c9277bb14---lonubuxez.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_off0000f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 17540 bytes
SHA-256: 9d8a0286e97000c692e3a9f3852e9b11c9a0b07fa3cf9d81bc701fa5f6adbb30
font_01_sfnt_off00011e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8A 11096 bytes
SHA-256: 553e660c17881a835e0d220143f954c44fba7c925ad1aa333f8228818b1b190c
font_02_sfnt_off0001386e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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