Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a062cf0b78ceba…

MALICIOUS

PDF

83.6 KB Created: 2021-08-20 13:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 20877e1ea536ff17648ff0304767a1b5 SHA-1: d4b20f7f7e0d00869d8f080134c25d54e32e8bd7 SHA-256: 49a062cf0b78ceba73a76fc3bf5f853e70fe8430c8c19bfa49001ab49fd3d32f
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/10577034156.pdf In PDF document text
    • http://jinohair.com/upload/files/fifidakemasiw.pdfIn PDF document text
    • http://come2menorca.com/images/file/zomuritopuzoj.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d47c8556b90---26917420710.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce36444bd32---jazafine.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/18f5b70b56bcbe6da6261a8aa46f0768/namakolosifakosodozu.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeed3204aa---moteporuxaxafagakifo.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/xenevejokomajumid.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160efdcf0161eb---mimoduwurolitititamog.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/87809697246.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/60645973461.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/vogog.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/ffe3ea9879ffe86be90ab36935407ec7/6644246093.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077b2383f1f5---84753422254.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/fixisabapipe.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/62664045235.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608486d8ecb41---depafovotupobagixi.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/nisisilipalexola.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/60908558176.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ba0f2ac89---bibed.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/zejisatepemeziwideruger.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609830bdc565a---84176279844.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774997e6b2d---radofugagevojelapiboxalol.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/if132am1b0nnng432bu0s4ng27/69652266692.pdfIn PDF document text
    • http://foodsafebox.com/ckfinder/userfiles/files/7756435393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+nvidia+audio+driverPDF 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_off0000e4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EE 10456 bytes
SHA-256: 48aa357946cdff63b55cb5dc48f64c6d1b7634f5a8587532ca375532d4dc3f2e
font_01_sfnt_off0000fcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAD 17056 bytes
SHA-256: 73ddfcfcc75c894cee7fc7beb338df473d0ec0c4aa5f8246512827c28ad8c7cc
font_02_sfnt_off00012948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1