Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b06aa4c25406f79…

MALICIOUS

PDF

78.3 KB Created: 2021-08-27 23:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c8a888a17974d103d5242be034e71f5c SHA-1: a4481f0643b8e127d32090205f4d942dff13788d SHA-256: 7b06aa4c25406f79ef5d92d380581c12d58f033743443fac53039653d2f3bce8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to drive traffic to these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://irlanc.ru/uplcv?utm_term=jacques+maritain+universal+declaration+of+human+rights PDF link annotation
    • https://internationalmedia.com/userfiles/file/pupavuvigasumilawo.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/jm857sc0h9r4lj9qk9ccvn8hq5/kulukofosi.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/kirivuzilofuzijowapisisu.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/pobuxagetixeda.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/40343603455.pdfIn PDF document text
    • http://peaktoppet.com/ck_imgs/files/divibajisawimaj.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d61bbe1f5fa---41937673104.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160730cd072de4---xezusakisop.pdfIn PDF document text
    • http://runo34.ru/attachments/file/39111924983.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de61e06291---xaloporerujadogu.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/pomodonasu.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/xupafukikugenixit.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16119fdd298a9a---18230292130.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/49245a8be196dc24625da1fc02f594d3/13524931822.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/wofuwulaninomodivirugidab.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/76473966929.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/85922788939.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/23f47bfbe004b8d8ea631fe533bff6da/nufixok.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/42354058305.pdfIn PDF document text
    • http://voijin.com/userfiles/files/42963798400.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/gebuforise.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f487e22da4---40551796695.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7c89d01dd---64521688221.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210717125101842195g39ek0vo6d1o.pdfIn PDF document text
    • http://dienmattroigiasi.com/uploads/files/didatawatolatafulase.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/votokixufusilosisutexowud.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_off0000cb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB35 11224 bytes
SHA-256: f1bc49013cf16821ab843989562c9fe77db5b031117bf0f522be5f61dd5df64e
font_01_sfnt_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE9 17376 bytes
SHA-256: 07ba13748354d5600ad8f5edf0cb188fdb12a53c819110768296f2072bd1b91c

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