Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a82da6896500d8…

MALICIOUS

PDF

85.9 KB Created: 2021-09-03 13:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bd9e8d4517d76cb6b38e80943d0e7a60 SHA-1: 3b0ab8dd6c968cee84c16b866ab9ac13519a24a3 SHA-256: 04a82da6896500d89d7206520f08121e3ef3ff1c8f83717d24dcc8d1fae14650
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with heuristics indicating it functions as a link farm, directing users to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external links and the nature of the heuristics point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://robalton.es/Albums/images/file///56988112996.pdf In PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/xojakixenenonuwosunedili.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/mavopebobugiwekuropeto.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b61046c521456bfd22bb385d2aedbb5/papemenamugal.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/91015061694.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/34605582132.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/xugupawajakeranapup.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/4308573147.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/daguraj.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/pudalozifogamizope.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6f1bc444a---sudale.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/tefenereza.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/2277cde6594606c0e2e023106bb37061/66654069276.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/rudubunonefamugaxubagagiv.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/mutasitup.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607444137989c---vugibakefewe.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5iesd168o9g6guq7jhglh2kne4/xofewapoxutezadilofav.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/pulidiranefenubet.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/pukur.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/zurazurajubavugow.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6843296c9---katafuwatikididitolefa.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jumusorofilovarumu.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/divepezefekovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fixture+mundial+2018+octavos+pdfPDF 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_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 19380 bytes
SHA-256: ba31e3e5e2a0369d086355776bedef9e3f015553f3c74c3e62dd3927e600ed8f
font_01_sfnt_off00011639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11639 11528 bytes
SHA-256: 7b17f2c5307af5160f85eced7b8d60c0f744a2f1130363a41546793c443cc1b0
font_02_sfnt_off000131a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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