Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5d21d3610650e6…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 22:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 8bf5a35afb1bd185af996ddf2a195f7f SHA-1: 00077f090191e9be9bc33cd7eb89b29fcef0acd8 SHA-256: 8e5d21d3610650e6977a5c271686723334cd08c243e73ca1cd91ad5c3e7d9f5e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://cructi.ru/uplcv?utm_term=alcatel+one+touch+pop+icon+a564c+manual+pdf PDF link annotation
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/8757721b7ca56ae51a15eb1a6fa2156f/xulajog.pdfIn PDF document text
    • https://zulapin.com/calisma2/files/uploads/58532787042.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/lataboxaxavo.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7c9aa471f---fivekefi.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/23672123692.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4ae1b3918---xozisekesuvixuno.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/ropeti.pdfIn PDF document text
    • https://kopari.hu/files/file/zepageni.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/63350313062.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/51832052000.pdfIn PDF document text
    • http://evola.it/userfiles/files/1732578389.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/kobazaxaraturesenu.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/nupejov.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12ea71e5c5---27909158815.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/44id6a4phhl8jvub7vmdaughqm/27969541137.pdfIn PDF document text
    • http://aweibel.com/Photo/file/wovepadulegoze.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/4ba81692b4becf80d9be104751942f62/12159504169.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e73ed3d78---sumini.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d99a4d7f123---vuganadapuje.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/25513304916.pdfIn PDF document text
    • https://apra.pl/files/file/12150670862.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/26328906927.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_off0000dd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 18788 bytes
SHA-256: 2cbad85df9047314dcda464975c129d70645c3227c5208d76e90b131995a6703
font_02_sfnt_off000126a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A3 11080 bytes
SHA-256: aee6394e47ce6a30913dd9afa14a7120e70f70a413f6ef149e50e9d948b9c3d6

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