Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2e1a507bec68fa…

MALICIOUS

PDF

81.5 KB Created: 2021-09-05 19:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bb3ca98e60832c7f67235f4e83491bbc SHA-1: 524170ebba2d99b4cc6b9003f5817ee448c10b22 SHA-256: 1b2e1a507bec68fa9c09dc1abf710a5144c52306c3402fadf0618dc1129882d4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with malware distribution or phishing campaigns, likely delivered via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=interaction+between+fiscal+and+monetary+policy+pdf PDF link annotation
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6239b963b4---24561573313.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f152347961---domijefosopaxed.pdfIn PDF document text
    • http://unityproductions.com/upload/files/vugelixawug.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/22124ebba795b4768fff0da0a173a1af/kubiworulorogatije.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/0k48i6q7du5d6evc677ccr5nja/pumowesilijebokovumot.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/futavumulifal.pdfIn PDF document text
    • http://metallpress.ru/files/2066481420.pdfIn PDF document text
    • https://wineart.online/userfiles/file/2233897136.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b31ae8155---kipugizoterur.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/daf7597ea2de74cc38faa2e651006765/zorukupaxodebopituj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091350a5e692---siweninoza.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/516f95372a733c6dbfd3f893fefedfe1/95883821932.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/jabujubovewigexuriji.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/xeboxafesikidenabes.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/18030312231.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/45765434983.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098422f3607b---80147611813.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/61598741308.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/watemudibenejosa.pdfIn PDF document text
    • https://khanikango.in/file/fulamopuxumunemivibumajip.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161063960b084c---sidesetolipego.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/sulemulidasotagove.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_off0000d7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 11072 bytes
SHA-256: 46824ee66260f701e0f46d3c10d344c84a9e50c7457c58fda9f2e338007c00c4
font_02_sfnt_off00010997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 17648 bytes
SHA-256: 44eede5e964be404ae42b741b6cd7052b325e4fccc8ecd7b443589485291e382

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