Malicious PDF — malware analysis report

Static analysis result for SHA-256 a433071ab16e07ce…

MALICIOUS

PDF

70.0 KB Created: 2021-09-08 02:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 10f02260d99e099a148045e4fa8a6225 SHA-1: d7024707b3b1a0b038afce37c7b65e0a73035cfa SHA-256: a433071ab16e07ceb9c2395e5aff1855c166210d6572f46d9475852fea3b6159
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a PDF vulnerability to execute code. The file contains numerous URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute phishing content or download further malware. The presence of external URI and link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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=education.com+free+worksheets PDF link annotation
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16116f6b1267f2---kasutexijokubelivudovez.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/66742948391.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113c9134208e---43532873764.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/97851601178.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210519074838.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/5ab9ce70e967ab460ac6806ed79f717f/gikepovevuduwunuzukaved.pdfIn PDF document text
    • http://sassyissy.com/survey/userfiles/files/fugol.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/90637985133.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/0737336a33e12adbd4a72536c869ff1b/49132228576.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/32991807450.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e8869193a---65619564720.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/76976473376.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/95028a7f1e1d4fb0ce13d69d6edc88a6/jegiz.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/bvsf7gi84h4n2i4hp3cirb7d55/buvalasu.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe838d6ab81---69376219397.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/43185986971.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d049a64a54---nuzew.pdfIn PDF document text
    • http://markone-tools.com/upload/files/divilezorokiteget.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/nukireraxakaputim.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/vaseximawosuziwisowak.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/48v2jqpp9n3g2ihmohiq4eghc4/wuwapoki.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_off0000b354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB354 15008 bytes
SHA-256: 6b69134e2080c31b981ad68f7112ad7ea47b33a92a283e2bf927e6c17e3550fd
font_01_sfnt_off0000d906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 11024 bytes
SHA-256: 47e874a43e05ffd54d5d6f5ef00fb70b8e733583f25bfe67f41be9e134369405

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