Malicious PDF — malware analysis report

Static analysis result for SHA-256 681c711ab8022aea…

MALICIOUS

PDF

79.7 KB Created: 2021-09-06 02:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dd9b0f5f26d284640aff92bc1f97f8bc SHA-1: 7a618b06ab14dce2423571b21489a42e09eb7a8a SHA-256: 681c711ab8022aeae4f621eb8769dbc9715a992c47d15dceb2c2659c355ca796
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a lure, presenting a link farm hosted on compromised CMS uploads to encourage users to download a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure suggests a multi-stage attack where the PDF serves as the initial delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/63a91fa225efe3bd6177417330fca78c/bafepenixej.pdf In PDF document text
    • https://najlepsze-w-polsce.pl/uploads/19564140010.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/18479838354.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210518001655_1108499576.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/vefol.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/jagumetudedoxeferojumawa.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65730561770.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/tadipero.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/8c0e2f59c58496a5d1615c3b9d1f99de/bumoripidixuxabagumire.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eb26393b9---zemuvovaxonilinovusofodub.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210625_073058.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/61994970764.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/56e1917227c05abaab300912ae5e10de/19344475384.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aac587bf1a---70490903673.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/d9e492d365b0aa16397873641d320e30/wadamawedofozuduvofedaraz.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16119a873250cf---vifiwizigado.pdfIn PDF document text
    • https://artenika.pl/fck/file/68154687262.pdfIn PDF document text
    • http://plncse.hu/php_data/file/58109189608.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/vipes.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210815184755.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/40f416b919a257e39626f8abf7cd24fb/35066657239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=conversor+de+archivos+pdf+a+epubPDF 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_off0000d195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 18160 bytes
SHA-256: b8f935d934c094abb4c1c0603b71ea732e08422b8be1a55ba286c5c2ac2b28e7
font_02_sfnt_off00011864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11864 10912 bytes
SHA-256: 194fe67b67e02d8fe99ac718a2d1513525c51cc6dba7ff76c60dd5a3ceec409e

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