Malicious PDF — malware analysis report

Static analysis result for SHA-256 352701efb2fe36d5…

MALICIOUS

PDF

89.5 KB Created: 2021-06-29 02:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 10e0003e47ffe2b088e4fe387e638238 SHA-1: 12fd397160c08c79655923601c709389596da215 SHA-256: 352701efb2fe36d50577abfdda7f7955751eef58e839f014c666b33884a8414f
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=cyst+on+the+bottom+of+my+foot PDF link annotation
    • https://mangmalungtea.com/userfiles/file/javazejetod.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/gibubajajagupukajo.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/20521484605.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/safusesujazanodejawuxizo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d23bff149a---47490774986.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917b6a5da8b---87748027908.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/dajakiwusanadobudisu.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/ev8dr3gtcv83a6pg3g7503gvol/47733334780.pdfIn PDF document text
    • http://daydala.com/userfiles/file/61102462487.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62402427549.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/wafunadowepotepojulor.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a22d8b10e70---39645081642.pdfIn PDF document text
    • http://mldinsaat.com/image/files/netugafezelefolafisa.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eee2d4aab4---93070194159.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/39871680096.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a0d1d270d---jororivibenepuvoz.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/3737215220.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b7a9cd15---dibijemavidawulova.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/rimepitepanodol.pdfIn PDF document text
    • http://4bx.pl/public/file/wozimagizekekomib.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/daa7ceb0b037bb22213997082bf417dc/39170340106.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/e71e1da2fa8cfc6e86ab9247ee75010e/jexefot.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_off0000fce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FD 10364 bytes
SHA-256: 58ac1254848cff62911a061206a4fafd1b1310c38d5e0fb8f5d70b6f9762fe62
font_02_sfnt_off00012c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C40 17064 bytes
SHA-256: f18fab83539a2446e9115c2b78d8d5dabf7a08bdc1fa9e56d83d31c9eb399a4d

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