Malicious PDF — malware analysis report

Static analysis result for SHA-256 922474b21df198f1…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 05:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0ba51d0ce92e612012ab856fd05db515 SHA-1: 5ef42d4998c203f145fe9011b7ba704e729a58a1 SHA-256: 922474b21df198f14d74857416ca77cc721d0e660583113f4ba4c7a42cb9df4c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malware or conduct phishing. The PDF_RANDOM_URL_LINK heuristic specifically highlights a link to a PDF hosted on a suspicious domain, indicating a likely multi-stage attack. No scripts were extracted, but the presence of external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://originalcheck.it/public/img_admin/file///sogefif.pdf In PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/5bfb7d458548282cf20a2f2fd4221057/64214760260.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/86504db56d083411b5705537fcd09832/65950775532.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u5dh769o17ticlj2spqfp7pqe4/gawotubev.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/49132242632.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/3h9af4cjjg56c6kmfqmv7tr353/31492073610.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/pifajojinumowadav.pdfIn PDF document text
    • http://jp-cable.com/d/files/wepuligaxozurekuba.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160adeb0b2af78---tofikixezumut.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/2d25672b49b2fb025f49fc6d4d71f90b/fifex.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/29523521685.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/dipaj.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607713a47dfb2---xojajetit.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/55654564611.pdfIn PDF document text
    • https://projetovm.com/uploads/files/51865611027.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/169fa3c9a05a0087ea95332ab0423bd8/11294148837.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/13vn7qqivbv0t9s6b89qmcfj6a/76752215102.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16070d2d2282ee---86684686664.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ecf79f9f09e0042139af1397a870e5a2/xemixumufumewik.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/iuopi7pfbc68f4ervmvktaenj1/xekasukokezunovenutewap.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5b46ab4a2---42480294834.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/vanurakitujuzatajotigubur.pdfIn PDF document text
    • http://954move.com/clients/4890/File/3301195370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=converting+from+degrees+to+radians+worksheetPDF 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_off0000db81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB81 19076 bytes
SHA-256: cc18970e751aaf078f9d4406ce8323f8c560003908260fd0507e649c60a4e360
font_01_sfnt_off00010d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001258a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258A 11028 bytes
SHA-256: 6236542402f30ebf9523af14fc3a5f7d959c474ea4f01bbbb064357b7c8c8e46

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