Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d58d35ca6f1cdc…

MALICIOUS

PDF

83.9 KB Created: 2021-07-20 02:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7a0701a013df37fb2754c58e19b93600 SHA-1: f1cc98cc41a753d9dcf411e733086e5b429e13c5 SHA-256: 95d58d35ca6f1cdcfbb5c23bd99d53c31e014cce58867f3a09f9fa70a23722f0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The PDF contains numerous links to external websites, many hosted on potentially compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of external URI heuristics and the overall structure point towards an attempt to exploit users by directing them to untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://nutronicltd.com/userfiles/file/69597366687.pdf In PDF document text
    • http://alexlunacoach.com/img/editor/file/11146109728.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/kaziter.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/97965221218.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/0eqcmd5kprr2tv7d2c0lu39qtk/jimuwim.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/71296806714.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/66436032067.pdfIn macro / runtime command snippet
    • http://anandtouristcorporation.com/uploads/43379508940.pdfIn macro / runtime command snippet
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/90388f07a242d8949c38d44c6d62e30a/jotovu.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/rugikukezozo.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/5373372948.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/80df704a27d8c81c9056686f4d78cca8/66997689910.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/1709dd10bd3e5ca7949e5229ac5a0457/vewunurabojefesejiwe.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/80d42b986c9522838a92a9533b85ccd2/98515641754.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/2096439847.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/zarofofozomebamezapenilux.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/losilasowud.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ijr6hr09g90ap240sa8m4qhmn6/pajezagokik.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc8116bb2d---kebasavi.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/derumipumiwomunolemisa.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/16258069059.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/99511179168.pdfIn PDF document text
    • http://domusanna.it/userIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+need+to+take+deep+breathsPDF 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_off0000e6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E7 16912 bytes
SHA-256: 4a562bcf9ede416810e05f4520d239221b99fe3314c69620acab12096173a7d1
font_01_sfnt_off000112a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABC 10544 bytes
SHA-256: c49f045868127848b56ffd32023b892ff77ad470cb4e7ac205e899f56643392d

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