Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9eaf553bfd7ae31…

MALICIOUS

PDF

85.3 KB Created: 2021-09-06 17:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7cac11ccfcbbbea88ffbed51ab6c833e SHA-1: 272bac13a876d7963fc338f4dcc42250a38a6aab SHA-256: a9eaf553bfd7ae316c666cdade23bb0a51aae911db1b9063f5b5e049e7e7c471
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=pdfmake+arabic+character PDF link annotation
    • https://esperanzadeavila.com/fotos/file/vakonujelu.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cafe513169---96700359780.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/megunetidisekikuvukuvofez.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/mepev.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/98467197719.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/35010924910f3289d0a941c5e6d763f7/81433751980.pdfIn PDF document text
    • http://sswjeans.com/files/95202441930.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/48fec4dcc05d478624cb6b8467c42a94/wexepepiwezivuforoduso.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/vegamaxoxekoxipuleduxegus.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/nodab.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/bowuratuzap.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/tariwubujalidadukusajobo.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/xoxidijilibexagepesak.pdfIn PDF document text
    • https://digireg.lu/upload/rigiwalapafevu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafee01bec2---xuvuvisidi.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/71cb122391068c4a61d7bd91d420adb1/bovalimezobesudora.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/b3ba71490665226ab6e063927979c3bd/4298419309.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/purowijasu.pdfIn PDF document text
    • https://t2sc.me/userfiles/94100879299.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb501bf2a---62981476578.pdfIn PDF document text
    • http://dejede.com/userfiles/file/nusemukezarimuduxeri.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/35895524040.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/79234730310.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/46250577655.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/wetunafodamigilezifaruba.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_off0000e197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 20204 bytes
SHA-256: 23290a381351899d82401ffc514ac06278ac2f2716a15bf2080b32dc0afccf02
font_02_sfnt_off00012e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4C 10536 bytes
SHA-256: 886cfa61b2c830f618da1c16c1950df017d1a8a0965c8c17066c893d15da0ff2

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