Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f1ce7a80696c3f…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 05:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 64dc3945f5e712d1899f7df8dfc5cbad SHA-1: e389326948c2b5e0540256d55ae81b5a7a0e98e4 SHA-256: 19f1ce7a80696c3f53f305dcffbbe5b86176a729140b8ec7565a4d15b0e4890f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://chcial.ru/uplcv?utm_term=mahalakshmi+stotram+kannada+pdf PDF link annotation
    • http://xn--elementy-zczne-kwb98g.pl/media/file/52383635265.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/61619540096.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/97746212595.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/zunanibutevif.pdfIn PDF document text
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/32304707237.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a19adcdae006745ae1bafaa2711dcffc/34653753921.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/li07opc51chd9pdtk0g7frffg0/zavesuluvepufupaguwif.pdfIn PDF document text
    • https://e-room.co/userfiles/file/mezub.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b88ee35538---19264521615.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/favoselavuzegudosijez.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/badavewuliti.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613259e9a0286---gulopirutojumomanapezawuv.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/nujezogigunumutevexizopi.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/nuroxokebasag.pdfIn PDF document text
    • https://europartner2.pl/uploads/jikubomodufevodegebisu.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/7e5ab989e690619d006c0b34d4e7ce10/xivazogamerojotesegex.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/zuwes.pdfIn PDF document text
    • https://webaprint.be/img/file/10166573394.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/jopakatirezuxitazod.pdfIn PDF document text
    • https://landbar.com/upload/files/81693237256.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/zekagudusitumivo.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/52953940094.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbfce3890c---faxojugepikibanurez.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/98107986360.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/14382906597.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_off0000df1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 20064 bytes
SHA-256: 7498ee8f9a98c63dc584b9e51daf4b59694d59d5b67d47319b1ba994459c306b
font_02_sfnt_off00012b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B84 10716 bytes
SHA-256: 4d4927bb733974656426c657682db9cdb1b2e4e4c0ebfc41162672b714bb2a1e

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