Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec504016ded1b9ac…

MALICIOUS

PDF

85.8 KB Created: 2021-07-26 00:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6e276bce24030109ccde0c9e09e69a27 SHA-1: f1bccc8350715cc5799cfdc3b2286f4bc0939a0a SHA-256: ec504016ded1b9acf4520686dc38e76d856f2dc988f179607d2deb97e0c5e71b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d734b495b---vikirobej.pdf In PDF document text
    • https://arch.ua/ckfinder/userfiles/files/digukazunavatamakejopud.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/72574952042.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/1097b224219f36969083a6de296c8d2d/tuwavixomixenawekafipu.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/55956530205.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/41183594673.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3e43cc6ee---bopapexifimewe.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807b674b041---fobunegedobabozu.pdfIn PDF document text
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/56579659667.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/25610431232.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/090aa7b48568839b5d11cb9c83a0b96d/3264410344.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0423031001625229056.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/670bj40rrfh63bgc1sk23drg9u/21965250041.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b37c32738---pezixitomaketexiwixilav.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077d5b6e82c5---neponikimokujevefok.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/82f379d7f5024464470489fd02a4c3d1/50664398207.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/xuzoj.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/5350452d278878caf399417ae5ba1629/60840504839.pdfIn PDF document text
    • http://tavio.su/files/file/54082601409.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc8e3bb4e9---59395603994.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/jnauj793f1f1k0lqcjmqh1me41/wereguw.pdfIn PDF document text
    • https://hagepoorter.be/files/files/3517990159.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/28a90f29387a63874473fe75a9395960/pexuwukikufixevuwufumur.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/b7b25ebf367887e68763a49ba4305f6d/11919680965.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/51456287147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=arctis+pro+wireless+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 10700 bytes
SHA-256: 1c103d7144e33f809a2d8739da139f0e78ec8452d100608973288577a95fd74a
font_01_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9C 2296 bytes
SHA-256: 0d91b93c30cdb4b9fcc5287ef31e0f6d3b75050094e35c3303e90e7f2c1d387e
font_03_sfnt_off00011997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11997 18656 bytes
SHA-256: 7329a592a1bbfe67cb94a7b4153e07d0db070f57a5f9e157d8f97ed5edc90e7c

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