Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ec6efc798e8580…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 05:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cea8e895f8c7fa01014950d953dd5588 SHA-1: 022201a38322f35d70fb2e1873304a942947191b SHA-256: e1ec6efc798e8580c4b546ca3198dc237162a2eb37ac37bdfd10c319bef5a02d
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites, suggesting it is part of a link farm or phishing campaign. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line interface, a common tactic to bypass security controls and execute malicious commands, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7163a55b6c---1998319889.pdf In PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b55da8e5182---modaduneferot.pdfIn PDF document text
    • https://basisangka.com/contents/files/rurakovulinepitoloruv.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/mivuramav.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/36580723695.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d979acd3956---93876497128.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608035615f67e---32219980291.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f531c9748d---fodorariwojoluwivekilafup.pdfIn PDF document text
    • http://fygl.net/uploads/file/162227407708.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/67817c112181b23bb431482bf30a0f24/ginaba.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/pukapulemiposipelemulizav.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/zunezokapeduparisodupekik.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/70351816744.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed2fb6e0b4---wupofokizapusevuramisu.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/nasipedinolob.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/wezoxizifilitevux.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/loduberuvu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836686bfe9d---xikosuguviwavafidenufapip.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/d62bpb55bm7edu5hrjiinsq7ha/93410212455.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/25127059230.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adcb923aaa---fomamexisikukebu.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/a41a4bea2d20a27a721153e07bfa2daf/96234300800.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/59188ed50ac28e5ce68ad5d224b3b2bc/wasufowusitabejorojut.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/44j8j7rb6812h4gubqn87cubo6/73183824090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=examples+of+how+to+answer+why+are+you+interested+in+this+positionPDF 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_off0000dd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 11148 bytes
SHA-256: 0dc81e0a051139c6b2af41cee261b3c15131bc3e8db284f9577c5c4356a37c56
font_01_sfnt_off0000f788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF788 17752 bytes
SHA-256: ae7d4a4fcd74cb5e18490f10742cf670ead09a9eba5ac14c571d88a5351fa6bf
font_02_sfnt_off00012585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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