Malicious PDF — malware analysis report

Static analysis result for SHA-256 210acc7dbdd15cf3…

MALICIOUS

PDF

97.6 KB Created: 2021-08-26 00:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8eee3727619c8ba77ba8761c99a24f29 SHA-1: 285d7858fbc34e9c04b4c930c49c02df6dd86a8e SHA-256: 210acc7dbdd15cf3a834af5d7d283dc623a7df63973010a8be689dd15076dc71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting. These links likely serve to distribute phishing content or further malware payloads. No scripts were extracted, but the presence of external URIs and compromised CMS upload links strongly suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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=arabic+quotes+in+english PDF link annotation
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/pagedufa.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9d11c3fd8b518766382c7ac4439b20fa/nibidogupujulegot.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/muvatudirugejizedila.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160739243e9221---nowotigi.pdfIn PDF document text
    • http://korytnica.net/data/files/bijage.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/33254588063.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97dc88d6c---nesijeribabex.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/89142983093.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/a97ls7n6bahh1m3f7se1osk72l/dexijofubidajekabavowubo.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/viwamigitijegipa.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/aae5f5b074aa1d0818f9b5e18094ef62/70097751669.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb364e6ee4---34180139148.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/nukop.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/226f9792536518b1f0b716760a020b23/nivaranevikupamorix.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0de08d749ec76381550af835c92c6b54/20928776893.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/42424598531.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/18660433977.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/kozemukilez.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5d2f17aafc54885cfd55f0eb587fb7e8/rigesajinululadu.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/85434657802.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/7578244327.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/11821715048.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092ccf31005b---nunamofo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011097.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11097 29960 bytes
SHA-256: 1cd302b788db8c408c1c9763b0332704698a53e07e7b674830d1d71e39193e15
font_00_sfnt_off0000e4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 17160 bytes
SHA-256: 6304d4ab9f321c92bbf6215f413ac64a75279ccfa3d9a45e4e5f23eb200496df
font_02_sfnt_off00014645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14645 10876 bytes
SHA-256: 3510d4c8524146a32a68c75d2ae13056092c13471bdfd156cd0b46e72b859738
font_03_sfnt_off00015f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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