Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e40f49c6c1e660a…

MALICIOUS

PDF

80.6 KB Created: 2021-05-07 02:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 331e19dae1153cc06c23e9c54d832cca SHA-1: bb3945b3c18a61afec34bfe7de2cbc23c9b45046 SHA-256: 8e40f49c6c1e660a96e411a8ef8286e19a93d291936b5c1321cdebd413c4348c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://philabc.ru/uplcv?utm_term=military+college+murree+admission+form+2020
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4d243a4f---fezazoputenixuduka.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b8cf5e2d29627caf866fb147796d0160/lipolovo.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d5a20fc8e---pakerulojuzubodo.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081acac51656---zixonofar.pdf
    • http://ankamet.com/userfiles/file/katokuto.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/cd93d7b4bfb55c69e8157283e063ab17/87247633403.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb8db0853---fepisimakalisotaxodol.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/9a03a3b419dba2fb0bc87e7df81b8ace/mopizozonukel.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/be6ca85c1d9df5573f6bc088ee29d3e6/83452849315.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160857c160f081---14445449164.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d1b7ea526---68745386073.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609466e63e4c4---6368245345.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a736fda5bf---duwijeximag.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd0f57500b---68710323942.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160841da61e9b2---riwunegipi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off0000e572.bin
efef606a3c17ae1b492fb1220f104be6e75e6314d4cb176abc1f41f7f2dfe6a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 5724 bytes
font_01_sfnt_off0000f8ef.bin
8b1d77f53499cea0ac1c4d0ecaa1eb3165f9b34e34f743ed370dd0dce5710fe2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EF 10852 bytes
font_02_sfnt_off00011e21.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E21 16060 bytes