Malicious PDF — malware analysis report

Static analysis result for SHA-256 db05c6f284a283f8…

MALICIOUS

PDF

70.3 KB Created: 2021-09-05 13:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 98fb557c25fb64564fab79852a4f3888 SHA-1: d0453cd8f1244f3ab824841306a71019d500ea69 SHA-256: db05c6f284a283f8920c084b7a8ec203e2bbde795a971eca6863b6a93453bb63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The file contains a large number of external links, many pointing to compromised or disposable domains, suggesting it functions as a link farm to lure victims to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly suggest an intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=nitrogen+cycle+game+pdf PDF link annotation
    • http://musorcentrum.hu/files/article/file/wakap.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/79508561748.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021072408584180554.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/97683799653.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/36446962814.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wegisanejufapoz.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/podaredewejiza.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607447f44bbac---mavexafazixefobawir.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/86b44ed6dbde4379e362a62579891738/83955143089.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/darirafidobizujadap.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/duforodaxovi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079de357f05f---vodowekazapetutaruduwanu.pdfIn PDF document text
    • http://ropesadventure.com/d/files/tidadoxikakaveravobomawu.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/3356572214.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/jinulesepar.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/57622643540.pdfIn PDF document text
    • https://mollis.rs//files/xaxuwi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e3035a6ceb8---2865416992.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/44042511968.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/1lp1de2tvndp87oe4bnl260o5p/vutipat.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/fewote.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ee997d45224e52ec9914e6639c1ffebb/venukunafamomidubik.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55d3df3056---jifajekituxotorowepu.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/forogureligevojagasez.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_off0000b486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB486 10888 bytes
SHA-256: 0599dcf5144aa76a1d24c2cf931c439c4dd153193224aad03c1e373989a02638
font_01_sfnt_off0000cd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD82 15392 bytes
SHA-256: 8dcda7d440b69fa4e1396f61bdc814b012b9f866295bc36c2f3a1383cd2bdc3f
font_02_sfnt_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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