Malicious PDF — malware analysis report

Static analysis result for SHA-256 abacf09beb8edc89…

MALICIOUS

PDF

84.9 KB Created: 2021-09-06 18:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 240f12089281029f1fe52b1bf1ca07a2 SHA-1: 8031bf9bcee76fbc30928d7bbbc16d9747cb27d9 SHA-256: abacf09beb8edc897e44fb6693f880201a08732578603f2d12f7a27e5ac7cdba
164 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm. The presence of these links indicates an attempt to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the structure and URL findings strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090b7cc278fb---77653747716.pdf In PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a4ee1432---67627023719.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e8195a087a---pumuxagifulumopu.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/menegizamopomuxubuli.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9ba7defe2---47203382420.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ecf837609ae4a881e5501101fac3e146/kametetewavoj.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc411a2b6---93827963581.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf21fa52cd---wazozutogubaroxola.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee7c1679f---gusokav.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/48330529742.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/3206142412.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/27423529134.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/0mbaopt96s729gp75912lm3j8i/38335240560.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/1ec65df150cdca241974eb62434bba11/latobiwasagufejet.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/xizurevab.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607230d481c6e---wosebozujevem.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072f03004a21---19933554617.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/89919675908.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/gp3oqp7r5b89oh4pv90009mboo/13543439534.pdfIn PDF document text
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/odn58jnvjan5383d8vs1n15l8s/fubatesatizadokirojek.pdfIn PDF document text
    • http://chinazzjx.com/d/files/43581968281.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/99850486984.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/donumunuvuzimojavud.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/thlprqfs84aij6eta3dg5gbnvr/govogimalazobozewegoxaw.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/f519a4e47727723d5145d31fdff67950/limepupewifigegoxod.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c48cbe5cb---zizusakelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=second+and+third+conditional+mixed+exercises+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_off0000e536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 11060 bytes
SHA-256: 01ef062061bd03119bb2abb1f59e234e51077f67080de3fd6544468ecc77c9c3
font_01_sfnt_off0000fec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC5 17892 bytes
SHA-256: 21afcf8c26c6d9852dc9a0c9e657ee38c6ad2175855611bc4983eaff290961c2
font_02_sfnt_off00012d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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