Malicious PDF — malware analysis report

Static analysis result for SHA-256 116487f40b604a42…

MALICIOUS

PDF

88.2 KB Created: 2021-09-02 11:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0e722f39831891ca1299a29b88602956 SHA-1: a9f4f71d74a007665c971e91239d76d693e1351b SHA-256: 116487f40b604a4293ac8a856c5f58f3243c477566dae0a99f081ef83f1a8539
196 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The sample is a PDF document flagged by ClamAV and an ML classifier as malicious. It contains heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. Crucially, it includes a 'Clipboard command execution lure' heuristic, suggesting it instructs the user to copy and paste content into a shell, a common technique for executing secondary payloads. No scripts were extracted, but the combination of these factors strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.kingsmen-cmti.com/upload/files/tisatawasus.pdf In PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed48030a2---44187590030.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202108140221174000.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/fedutepitezelexowilod.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/97088900309.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/79472231010.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210517013512.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3269e627d---76553796207.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608f50e09a0d1---30604292418.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef3a592742---paduzotanawore.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef0378db4a---81648180103.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d94d5cefd6570d56302f992a903e7e1c/88347317414.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/0da4186603b2773e25dea79867aa418f/62756354447.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0d5d519061---9030898680.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610aa4208506e---nidumudesoxekawopenesapo.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ra4frp27ehtp53d3qt8s1optq3/50420924219.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/23752562586.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/1at6tiaaafncji0fvv37csqgc3/12505944015.pdfIn PDF document text
    • http://i-dron.cz/data/file/80143525778.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/43348062652.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/74c1f2f13b27d921125d8df9d939e628/rezosuwabikat.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/zelawiterawajije.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/menexivaxomifirolorewor.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/79759238564.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/luwowiniduxiborukeki.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160cd86b95b892---kajogaxodejojaxugo.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/tizolelubepewerego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=merge+multiple+file+to+pdfPDF 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_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 17420 bytes
SHA-256: bfbf2ba50f802826c3f37b263e00dffa161960c85d2d0dbab8e1a60c3438fb2e
font_01_sfnt_off000123d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D3 10500 bytes
SHA-256: e810983213a2edfd21d11d4655d6d722d2a690264ddb8fd4cf58f693e98aaeec
font_02_sfnt_off00013b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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