Malicious PDF — malware analysis report

Static analysis result for SHA-256 948198be85932b65…

MALICIOUS

PDF

91.8 KB Created: 2021-08-13 11:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8a0f257411bae58629b7f07196e0061d SHA-1: 4290375427a7965d0ec1facab65273b64d08975c SHA-256: 948198be85932b659793adb0004f39c8e0337f197d5cdc5e18ebcbeb8fe2a865
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or hosting malicious content. The document body is heavily obfuscated and does not provide direct clues, but the overall structure and URL analysis suggest a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://tagoproperties.com/ckfinder/userfiles/files/66618678257.pdf In PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6d08e80b483c0a06e61ad7b6b4e57bdf/zukikibatotagijugobemo.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e50bd5b2927---64288316423.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/36909117494.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766a0ab1746---47006113210.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c79e5c60---ponen.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f115e7b5c29---vajobisuwubasabitepulagev.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a25e03b6d44---palesim.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba455fd297c---faxobil.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/ritexapewid.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/2eb5a66aff66b5f1e5fd1594fd7b2be4/61921946143.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/gumofoxaruxafikatugiboni.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d75ea3f29f5---dakawozutewipipulofur.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/59624880859.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/49e27fbeeacb8187db5127b4dcd3a53e/83770900327.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/29569887076.pdfIn PDF document text
    • https://flying-vikings.net/UserFiles/file/46606768696.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f389368a7---rasola.pdfIn PDF document text
    • http://come2menorca.com/images/file/73756552622.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/tisiponosul.pdfIn PDF document text
    • https://fratellifurloni.it/file/31271528203.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/98915629466.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/10586208010.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/40376157624.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0e6869c1a---mojejomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+does+ph+affect+enzyme+activity+labPDF 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_off0000fe8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A4 11244 bytes
SHA-256: 1475ce47f909684aaff8d6aa305b38c3693fd0b253bb8ada70fcfd9a4f99da23
font_02_sfnt_off000130a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A7 18780 bytes
SHA-256: 737e26d55508bd95e7bc298ec60b25898d2a291698b85a76418f6e7ceeeab4b1