Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7da75472cc98494…

MALICIOUS

PDF

74.4 KB Created: 2021-09-14 13:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a1596e674b38e60b768ee44a6991d684 SHA-1: 9c25fe70bb105a8ed2a4cedce5951156c3386e4d SHA-256: d7da75472cc984945df58cdd72288b6a125a28ccc62c6c1a608f879e95eb69d7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to PDF files hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=how+to+stop+ads+on+android+apps PDF link annotation
    • https://bwhe.in/ckfinder/userfiles/files/89948785797.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-13/20210913113339417220.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/zopikunupepojo.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210908202647_wnhyli.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/5c5c550932c7f9fcef47d32c7f560b85/66591783274.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/13155312976.pdfIn PDF document text
    • http://travellerisland.com/files/82741128929.pdfIn PDF document text
    • http://afslab.asia/upload/files/94021982446.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/nigiwirom.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/toviwafomube.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/17417001415.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613DEB87E362B.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/nakunekitizexu.pdfPDF link annotation
    • https://sporyolu.com/resimler/files/solalododewuk.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/52831317892.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f29c7b2da9---xotaregajopokifol.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/novekepulutudagaxojere.pdfIn PDF document text
    • http://montesantangelo.it/files/files/60740909450.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/nigigolepowejolizagen.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/3259d18896274b4e48e293f74b282ebb/vovelizakunitajogaxopeji.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/tulezegolilekakol.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/44922897890.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/xafevute.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_off0000c22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22F 10284 bytes
SHA-256: b8411789a225dc4883f44ed960837359302dee42a178041653de5347a0917e15
font_01_sfnt_off0000d971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD971 16436 bytes
SHA-256: 97da2dacbb9039529cd72d69cc354cfa4a3c634582a8c349f3858cfba9ecaa6a
font_02_sfnt_off000103e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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