Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11892802f3e54cf…

MALICIOUS

PDF

87.5 KB Created: 2021-08-06 03:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f726f6d0ca69c1ad655fbd8c10fe4d64 SHA-1: 075133a938cfb6f83eff013a9791cf0aa5dbd488 SHA-256: d11892802f3e54cf3408e7524c36f91958de7e6b1127b121d7e10f744cd4a408
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are indicative of a malicious PDF designed to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609281ffd1a59---76602369515.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/baec27262f1fb577ced1483fec705ef8/nedus.pdf
    • https://cristalensi.com/public/File/xigisitatimokabo.pdf
    • http://jnnycc.org/userfiles/file/20749358099.pdf
    • https://argumentua.com/i/file/52877540682.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9eadf3a4---gulisimikebufiwe.pdf
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/voragokugeno.pdf
    • http://chretkinia.pl/userfiles/file/17925068242.pdf
    • https://autopratichesas.it/file/44013685552.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/69b99c32090d751ecba512cfdc9e8b8e/31749726437.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/654b883a7d2e14e611a141193b70d61c/tadag.pdf
    • https://geya99.com/ckfinder/userfiles/files/kapabufoxu.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00e6b693d---vawijukipozorovi.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/tm4ta1f4f37f012p6p369mnbg6/jodevonezonolozudazoji.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087469d91b39---61496135307.pdf
    • http://builderall.info/userfiles/file/jeniveve.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160db78ce05fbb---pitivedukeger.pdf
    • https://bak.vn/upload/files/71376260844.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070d60e1251b---dexikatejafe.pdf
    • http://gibisch.org/files/files/84502113197.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/36862d9d1db6ccca759141a75315c3d3/kasebopamulumuma.pdf
    • http://tofuyatogo.com/uploads/files/88309533049.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea2808b724---56808356460.pdf
    • http://charlotteellisscholarship.com/clients/a/a5/a56794a54ce3a7e2a8fdc514f00cf952/File/96200069916.pdf
    • http://capital96.com/userfiles/file/18963311463.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+lost+heir+the+fall+of+daria+guide
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f306.bin
cf4890ef60fc74a666f8763c06ece5d30e2fd3f0baf3bd8c8f5069559f65e75f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 10592 bytes
font_01_sfnt_off00010b24.bin
420b97b26dccfb978fd6ddcadf40370feb901501254e27fb9b703d787746cd63
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B24 17264 bytes
font_02_sfnt_off000137ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137CE 16792 bytes