Malicious PDF — malware analysis report

Static analysis result for SHA-256 727d26d9cc8b0214…

MALICIOUS

PDF

88.9 KB Created: 2021-09-01 12:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb008fea20acaf4de34a125463058119 SHA-1: 7b662f50be1f990347bcbe52dad8e4358341bcaf SHA-256: 727d26d9cc8b02148dc77924e99e6aca2ec864606ba379c7e896fdd9dc3a1f12
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The file's structure and the nature of the URLs suggest it's part of a broader campaign to lure victims through compromised legitimate sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://crysiq.ru/uplcv?utm_term=give+the+back PDF link annotation
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927d1bccbbe---nerujeritavozo.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/lomum.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084fff55c274---58150318485.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091d6e205841---62491942536.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/jimagejas.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/404867775.pdfIn PDF document text
    • https://amsteroverseas.com/ckfinder/userfiles/files/55820546865.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/38116982329.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/7526fd670e9fde47280081cc5645ee0d/fafitopugeduwuwojabanupet.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/pededekiwukopemixi.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/73962603447.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/nupepujirobenufedalenem.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/5qkjf8uhvlt99u36a3o0j90d8g/65682216375.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/gilixutiwikuwogajur.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/fuselogexuzapisi.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/87356478219.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bba0c2e20---50161006690.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160778dd76a860---fizaxi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160864e07e3932---laboxaparibise.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/fidelirebiborinezofewigew.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a5ff32491d16457d9a3c99fb383b6ea7/sakiketa.pdfIn PDF document text
    • 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_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B21 10128 bytes
SHA-256: 8e112ed2b8c55e84740622c652b46e394df46f98e7808e11ab3fcd27fd6cc445
font_02_sfnt_off000121f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F6 20184 bytes
SHA-256: ab8e04af12dd336d8c87349b61745f1510b0452ef0a3be9a71f3a2be63593a19

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