Malicious PDF — malware analysis report

Static analysis result for SHA-256 950aaed3d2cd9b7e…

MALICIOUS

PDF

87.8 KB Created: 2021-09-12 10:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1859340330b589eb249ea5b21ef55ec6 SHA-1: a4bd0ae4457fe51ee4c50a7cd29270ee5f8b7445 SHA-256: 950aaed3d2cd9b7e47a72a78d261ea2d84c0d9444483c5ca18b9c9597c92b501
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to external websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://lpsa.cz/userfiles/file/47939626610.pdf In PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/xoniridudibefozejadexis.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/sezikelaka.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210912015350.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/55891595969.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/56896710378.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/kedoriregozajakuset.pdfIn PDF document text
    • https://ebooksweb.net/files/file/99093049906.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/44314561635.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134230594b02---guwuwenodinomababob.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/75323422926.pdfIn PDF document text
    • http://zerosquareonline.com/file/6664337421.pdfIn PDF document text
    • https://parkettworld.com/upload/files/popagekatebigasawiron.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc726b063d---zolalunigetid.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/bujowimubulokiwuwadufo.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/zonewojoxaxavureputiminu.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/dojipoluzor.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311dd036a46---xibuderuzuxigexoniwudam.pdfIn PDF document text
    • http://gro-felix.si/uploads/kajip.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/tudewedupezuwiraxuzadeken.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/79557148310.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630963762.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/14246195158.pdfIn PDF document text
    • http://superpart.com/files/xonunovofamugikiwisixodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=lumiya+sl+viewerPDF 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_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A95 18056 bytes
SHA-256: d16eac0a3b60a48e2701a24691da931104f28a31e9be0f7794b75adefd8cb38e
font_02_sfnt_off000139d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D8 10272 bytes
SHA-256: c8511f68f13f1dca68154c45fbcfdc305ec0bd9f0b211f6e5aa3559e87b98a4a

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