Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c18005abadc0820…

MALICIOUS

PDF

81.2 KB Created: 2021-07-31 11:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: affff1be1e427b5209a5e03d30e22e0c SHA-1: dd8163569fdc7047b1aee8814a80433579601d04 SHA-256: 0c18005abadc08201d677fa8bc3b69fafa01bdaf196f53c5fcdb9b6795fb2e6b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which appear to be compromised or disposable hosting, suggesting a link farm for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade static analysis. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/zubisukajugegebes.pdf In PDF document text
    • http://vstarmp.cn/upload/files/20210721_043453.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/11063869953.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/murirorage.pdfIn PDF document text
    • https://digireg.cn/upload/pilulotelutis.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf0783a65---82810337478.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086477ea3bf7---witemajazokajejejipatur.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/vusimo.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/sitedinadojonomavineti.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/niwokulibuluvopi.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800ec54b958---regutejosawokamekor.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed6b292cc---liwekenafafaboma.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/97888455449.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/86355520111.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9ddccf185---23957842302.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/89343953752.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/89734105861.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b488b10d6---54831555035.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c9c08ad05---63204366460.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074883b0b20c---zukanug.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/30893198395.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/kc91goubh633c8pkvcfavhjgq7/86920177917.pdfIn PDF document text
    • https://hanmarklight.com/UploadFile/files/3489542827.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc4a642a0c---jasikinepen.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/1b83ae68c6090d13ca4a4b5d29091018/89014347003.pdfIn PDF document text
    • https://bytlly.com/1im3niIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=libro+fundamentos+de+investigacion+cesar+bernal+pdfPDF link annotation
    • 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_off0000d2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F8 18240 bytes
SHA-256: 3d5dbe79e13b30a8d4c5b40401ed9ff46b48c854609185d07a40c38d5b1c0891
font_01_sfnt_off000101f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 11224 bytes
SHA-256: 3509caf674b977b79b6ca357030e8649bd99284019438c42cea02ab8d20ef940
font_02_sfnt_off00011be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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