Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32c1aa603fe1922…

MALICIOUS

PDF

89.4 KB Created: 2021-07-30 05:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9a54b04ec10ad42a0ba8b8d4a0eb7016 SHA-1: eda629f66453dca6ebc23dcf7aacebedf19bfe00 SHA-256: c32c1aa603fe192246d041f63f0843aebd6bf9e159609c37a1a0126c9b0d4a59
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. It employs social engineering tactics, specifically a 'Browser Install Lure' and 'Password Archive Lure', to deceive users into downloading and potentially executing further malicious content. The presence of numerous URLs, including those pointing to compromised WordPress sites and link farms with UTM parameters, suggests an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://laborke.ru/uplcv?utm_term=krunker.io+aimbot+hack+download PDF link annotation
    • https://oliogalanis.com/file/22158953853.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae084c312ab---44654929662.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/vvq2boa9vrmg9oqehaetfi17c4/7875160070.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/zofisinememixurilosar.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1927a736b---45822045970.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/c13444383527bfa83da49a701e65a1f4/befuvakulofo.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/88de70110adf47032bfac6bebe1375a7/lenidelutubogibadu.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/dalipifu.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/rafigixadesizosoz.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/40tea8b9fdv8jbbkt1tiubai9v/91579232540.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609aef8b00dcd---tojegopanafi.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/69637402596.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/86e4f9bf8e471ea5b52534e6853c5501/97069590592.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/kesipijibu.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/36438c2252245775edfe31de100bd69d/70423171893.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/68168664056.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/zomelefizero.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/70155748769.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/66906105457.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/alr6dhm092ggakmtrmtack2kp5/tolakusubirin.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/cdbcda0007e1d927565bb4a87bfc2d54/50702028103.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/1daf7b4d0223414fcd8ce874571e4544/buwoxebu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a48bb417c98---mesukejore.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5aa37ae9b3---75583852895.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_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001108c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108C 10944 bytes
SHA-256: 0e87c645bb2dee6486b5e2721760a3bccd29855afff28ff3af8965a51105dcca
font_02_sfnt_off000129bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BF 17240 bytes
SHA-256: aaa3cc35df4ec017568aa82d83f0730a93cd8e56f3b280bfb64f10dc5b1c0e2b

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