Malicious PDF — malware analysis report

Static analysis result for SHA-256 e018b72288796109…

MALICIOUS

PDF

104.1 KB Created: 2021-09-04 16:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a758f9129227ee7aab40af82d3d82c75 SHA-1: f1aa9a6eebbf61222fec06a2d245cb960577a8f7 SHA-256: e018b722887961091a0b81cf783f3f8aba77101b8c65ac86fcd548166867e861
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm pointing to various PDF files, some hosted on compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The presence of a 'download' button lure further supports this, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mlsconsulting.net/cms/files/File/39051321168.pdf In PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/pusikiwiwi.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/vonexetelexuxoxedafoxugi.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/64843363048.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb1fae8c8b---kenufizeresadelupibakinod.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8c5d413dc62329378bbe3eaadb953207/vetipaguno.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e62ca584811---88973417943.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/buxeduzopoteven.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcc8522584---38250747691.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/76499574605.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839080b029e---webobumirabomu.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/36981307635.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/76073380474.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/jevixefejeku.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/divusinawopisaz.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/43445551661.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073990b0d7aa---jarepasela.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc3d8853d9---lakisofudemekim.pdfIn PDF document text
    • http://camonetinternational.com/files/file/42684947863.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/41833747377.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/birogolodonolesi.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/givuxojud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=jlg+t350+service+manualPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/tufojaw.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_off00012c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C91 11036 bytes
SHA-256: f20851634ffef2a39667fb5feb2c941a7561a0081ba44f9ed4191eab2d3c2cd4
font_01_sfnt_off00014665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E77 20096 bytes
SHA-256: 3ab8783700bdffd9aa61cd0aeffde6aafb6fcc2ea17c988947abb4f2aa449265