Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3bec77b20ec3a9…

MALICIOUS

PDF

117.5 KB Created: 2021-07-01 14:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 652200bf6a4f639391ddd7b12972d3eb SHA-1: d9e223ef8825d924c17c7bf475fe87bbe647952b SHA-256: cb3bec77b20ec3a9bcd4990631709aeabf2bbb4fa264113c7a1803022e647f48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The file functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious PDF files. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://twinslock.com/ckfinder/userfiles/files/44066893668.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/90ac4694f27ee2b09c8d237ca6c7365f/74678367940.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608474caa32fe---68440049733.pdfIn PDF document text
    • https://dock-levellers.com/upload/files/63727944400.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c13af7feb1---73375920568.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607d32c31aecb---satemataxovabujenimi.pdfIn PDF document text
    • http://drive4smilesquebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/divikerabo.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/sugerurunewiwotisubura.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/94d307de5eb9ecd8d33c5c4310ab2924/42443013438.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/fezopatipu.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/leparezurikifovejo.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/3114483268.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ecmunn252pat037p4ba7f3m5fd/24519420891.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c34c540f5f---42364639862.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/dowiget.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/93669910814.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/nemadepizuzitat.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c0107da1dc7a9b7b5de7adc186d23819/19307574795.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/gijomifobomokikur.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072faa002309---vakixilorid.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/le2qmdm9aqoo43ah9u4rgtjqv3/wuvetisixajoxelutoteguli.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7a699a52553d999d4bdb98c7ae23508a/dowatutile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=can+a+ps4+play+ps3+discsPDF link annotation
    • 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_off00016d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001851d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1851D 10452 bytes
SHA-256: 7fe0705a8a923600f479516cf604b0ca82c1e8131e7a70362dbc292095872fee
font_02_sfnt_off00019d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D02 17040 bytes
SHA-256: f671c95124df00974ae4e8d634f9f4f93514fcf4f76c5c206c487e5dcef2c916

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