Malicious PDF — malware analysis report

Static analysis result for SHA-256 b494fc42ec96a5c4…

MALICIOUS

PDF

89.9 KB Created: 2021-08-17 08:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5cae4a3c350ae4d1eba9cdd0eb3af593 SHA-1: 9d4f65a5a5165fb2d8b122aa6c94193d3b540e9b SHA-256: b494fc42ec96a5c4fe62e4187d34d450fd7e64836805cd88aa5db98a504d068c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on compromised WordPress sites, suggests a link farm designed to lure victims to external resources. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose but not detracting from the malicious URL findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=how+do+you+add+facebook+friends+on+snapchat PDF link annotation
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088164e4e263---17179123601.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c2caba3fd41---54227931458.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/a8f63abd7860d542356f54df826335fd/11419087823.pdfIn PDF document text
    • https://samowar.ch/upload/file/solilifezafeje.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085ed6d717e8---50118760783.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2e28d96a9859660aa217b7781370932a/60580129530.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/kapoturubev.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be8de675e69---23953962176.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/jekasuxananovu.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a87ff0843f6---52177448191.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/bisarasibuwu.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8f42db52---butiximoxewilidezodalub.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/d1b00e757550acf0e864f2f7425be0e6/xekiw.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/39160598914.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abaec5e5bca---82646445203.pdfIn PDF document text
    • https://fallsplat.se/file/gemosigisufajazelot.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gomifotipafatedagul.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/62120954280.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35b23bba53---13637563333.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/55307013961.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210716111053.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/85a9640096073117966953fcb868bb48/zinupowonizomot.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/xivevibajefokotiziz.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_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 11192 bytes
SHA-256: dd3f3628f3956805afbc71d5f53e92f8627b71de153e5069839bece623b9fd28
font_01_sfnt_off000111bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CD 17820 bytes
SHA-256: 595c41e572c693a9f08198503ef19942a9686f87cd71aa7a080b089101ea56e4

Open this report in the interactive analyzer, or submit your own file for analysis.