Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a892f930baffb09…

MALICIOUS

PDF

87.9 KB Created: 2021-08-07 22:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 92eb534cdcc7f1de57a156774df507fa SHA-1: 0069a46a68703599e1efaa1bcedc324d52f00495 SHA-256: 5a892f930baffb0974294a23c239534298265498dbbb428e0baad641dc661107
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings are sufficient to infer the attack pattern.

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 http://tecs4.com/intranet/ckfinder/userfiles/files/wevasi.pdf In PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bad88b24c---92082217403.pdfIn PDF document text
    • http://epicridesnepal.com/files/gufikek.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ve2mu17n4pmuomn9rvlq32fkk2/83596363739.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/kabopipinajijetivevaras.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/50708688995.pdfIn PDF document text
    • http://vejwun.cz/images/lipox.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4a3161e30---13308108115.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e50e01a003---79514561309.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/1025605037.pdfIn PDF document text
    • http://wych123.com/upload/files/pikoxorekugomiluvu.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/wolofafopebatowavuxag.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/15631535834.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210527113326.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/geselixoxekodaxumufemo.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/695cec862648e1a29d0060c1bcd5c0f1/vijaki.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c31d143326---65142226573.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/nileluwegaxe.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/numizozagafaxavixok.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d3d8c2091---kusofepod.pdfIn PDF document text
    • http://atrsara.ir/resource/files/wajefefibejozuxukumu.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/9607942405.pdfIn PDF document text
    • http://unseretochter.ch/images/file/31981120066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ancient+india+study+guide+answer+keyPDF 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_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 10752 bytes
SHA-256: b36ff8813de85115f87594c649c53b8b66d48fb704ed4ecfd309677347b896f4
font_01_sfnt_off00010c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12454 17200 bytes
SHA-256: b5af6333e24a05fa8604e5df699817ea22420258e1912e546722110098a8b3de

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