Malicious PDF — malware analysis report

Static analysis result for SHA-256 8063790fbe6cefb9…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 02:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 59b846fd54fb5c945755a7cd437b6fca SHA-1: 19538a6814f53e9bbfaaa93ecfc3fe76f8da6950 SHA-256: 8063790fbe6cefb95853f727f26b2c851256ecd10dc98a4dce6cb7910c07725c
164 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple PDF files hosted on compromised or potentially malicious websites. The presence of a download button lure further supports the phishing or scam pretext. No scripts were extracted, but the overall structure suggests the document is designed to trick users into downloading further malicious content.

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
  • 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://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a407705f84---64534503270.pdf In PDF document text
    • http://tsmsaldature.it/userfiles/files/51389710588.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/58949351738.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/xesisarofowagegewonuwim.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/24861054506.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0d8ae0e46---14501509804.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/45255298449.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/48675157056.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/goradanidow.pdfIn PDF document text
    • http://health-bridge.in/upload/file/savemobufurudegixik.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed0a0dca0a---8879983353.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/67527471115.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/dadokeguwakupifopavi.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/81432756468.pdfIn PDF document text
    • https://ladymamashop.com/uploads//files/202108100829447900.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/miwopesujiwakati.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919e80dcd1a---buvuretoxemabenimulonu.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160984fa7c0801---rejatuxataluwazo.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/86703678115.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/nodalesozaxunafojugupegij.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/90091906897.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/eeb1c83a0613a0bcbe36b656286c12b7/29108558923.pdfIn PDF document text
    • http://wwstationery.com/files/file/nagusepemutisit.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/jutegowinivod.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/varixuwadadanokirixupuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=advanced+capital+budgeting+techniques+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_off0000ced8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED8 17064 bytes
SHA-256: 8eca3ecdeda1d0f8101beac8b20b73ab898464344850f4ec889cb551779eb5f5
font_01_sfnt_off0000fa9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9E 11112 bytes
SHA-256: 8152777c555a14ab7034171ed1b7d99f18f40e9a0039c9d3d42e09b4eb1d034c
font_02_sfnt_off000113c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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