Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7b251d9d6be481…

MALICIOUS

PDF

83.9 KB Created: 2021-09-15 09:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: acf94be40f235d6be573e770d79329f5 SHA-1: 9c4d576dc577ed5b0e5ea60e99d474fbb44b93b5 SHA-256: eb7b251d9d6be48123049c1faf10738b7e0dd0ff476db13030cebf0b8383353d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=123movies+love+actually PDF link annotation
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/pavokapugawigajose.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/kujetemufa.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/74752747603.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/dutolijekanor.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/pivubuwogog.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/bosarasisapu.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/92805223992.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/fe298fee4560c96b3609699969aaa6e1/meremobovenopozavozedigig.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109011655367502.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/kalegamisimoro.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/89611976219.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/mibuwe.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/21985852513.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/21228604518.pdfIn PDF document text
    • https://yuktogel.com/contents/files/danosafobawugizivigugesis.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/dupefozaneluzaxodo.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4737ef158c04cd93a0d622d83a7a6c51/jawebemunozikapuz.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/67872140898.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/4663216585.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/wugekorowogimixe.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/taputexaxusudodanelekelaw.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e736ac0dc30bf5590ce47fdd87943f98/10731689340.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/96887585826.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/cc7434bc93c6d587fdfa56cb7649ead8/60647363834.pdfIn PDF document text
    • http://mfcpavpos.ru/file/54677671221.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_off0000e535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 17160 bytes
SHA-256: 77daf12cc29ae35a7708586d92605af395772c4c94afe359890d26d3bcdda611
font_01_sfnt_off00011188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11188 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001299f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299F 10712 bytes
SHA-256: 2ad2a274d1b9d3338ea226013671a7ab2fc9b1b5fccaec2b04155d73d09b3f2e

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