Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18b820da128f113…

MALICIOUS

PDF

97.4 KB Created: 2021-07-29 21:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eca027111db1f131263ea8e1d5c7bfd9 SHA-1: b83f55fa10748ad08f6f12c218e76a31c4c7ed55 SHA-256: f18b820da128f113c6ffc10ae9a551726b43f2270087dc7a5affe6a5fe5a6e61
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Static analysis revealed the document functions as a link farm, containing numerous URLs pointing to disposable hosting and compromised CMS upload directories. These links likely serve as lures for phishing attacks or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://carparts-fixture.com/file/file/zuvuzakodezofugidigapi.pdf In PDF document text
    • https://megalightgroup.lv/uploads/files/zediloladiremelividax.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/be30176e5a38ee3cbc95f2fc082fa69a/2128080569.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8e6b8b43a---21187298335.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/3f7c5fb832b1a9e123901d58fda73abd/wapulibatajeforewikadeweb.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/49933748617.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16097856a6be07---66396386749.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/95314570050.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8be6c7e180e55c813d7007348c4778dd/goxawapilenake.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/3l4bqc85qeldkln6gslcovc6mj/35321445454.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46ab5f3ef3---55467318870.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b6ec8af1---28569883093.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/fanapasibukotanapokawib.pdfIn PDF document text
    • https://grnca.org/img/files/files/94579146081.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/088dc67541b89620254c0c1d490cec91/wefixinetotisekudi.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/46624580595.pdfIn PDF document text
    • https://ubranni.com/uploader/files/vututurunokukakexiravaz.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/99563488690.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/goroluduzezabovitisi.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/f9088e76c3790a84a3d568543d13cca9/nenagifu.pdfIn PDF document text
    • http://come2menorca.com/images/file/51331204033.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/18817846808.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f7ea7a318ba1cb6d8318f4d9dcf98f08/bejasa.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c055c2208a5---xamibugekajoxizo.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37730d34d---zitureladolagunedarovefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cessna+182+price+listPDF 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_off0001156c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D83 10660 bytes
SHA-256: 9c3ccbe79cb67b2a53925576b58c7a6c1d8e42d8ae153ba19f1ecd9908c57141
font_02_sfnt_off0001462d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462D 18648 bytes
SHA-256: b673ccd973e3a5fa3b4d505e7430c801f97ba1aea7f8698175bbfaf9575f72cb