Malicious PDF — malware analysis report

Static analysis result for SHA-256 e737210fececeda7…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 00:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c4af6534aa066745270bdf992063b994 SHA-1: d0b937bba9eb28ea9b26303e0e36a7bbde5df25b SHA-256: e737210fececeda7f6b0a4d099366e438ef38b998779958aca6f9eaad0acf0a2
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL targets strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://drafthe.ru/uplcv?utm_term=creating+an+android+app+in+android+studio PDF link annotation
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614e46d86c55d---46937391760.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/93600315910.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338c6daddc8---kusabenagonilulokad.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gujufojomor.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/napexak.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210918/16318950697110.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/fatab.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1632302579.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109110102363119.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/kefuv.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210911121106.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/neromu.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/fodajenokefebazixidarifiv.pdfIn PDF document text
    • http://accutindustry.com/Upload/files/20210916082739.pdfIn PDF document text
    • http://thietbinuoitom.vn/uploads/userfiles/file/68856897489.pdfIn PDF document text
    • http://ecocj.com/userfiles/file/20210922214839.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3895643110.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/bumemavurodarokimezu.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/zuwolorapilanige.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/winamogavamoxodep.pdfIn PDF document text
    • http://agrion.org/upload/fichier/sidojasezusesifax.pdfIn PDF document text
    • http://reichspfarrer.sk/file/gapuw.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/39271846691.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ffb9aqe99550autl5emn7qohrg/kufokul.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/55615687996.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161309904bb4ac---kadevadoputusuri.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/prkp4cjjvf67bsg5rh5lahtjj2/79837528120.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_off0000b662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE74 14992 bytes
SHA-256: 1429a8d85d7a5f31a05269e2f8cfe702e0239af430007fc7ee4d337a40e07ebb
font_02_sfnt_off0000f483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF483 10652 bytes
SHA-256: cf32403cf6c75ddd6206cac1c934372dff4495989b80280d32e84de6ada659b9

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