Malicious PDF — malware analysis report

Static analysis result for SHA-256 b549674d45b3ac9d…

MALICIOUS

PDF

87.7 KB Created: 2021-07-04 06:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: ea63253be5c580dc3f5d4b033389329f SHA-1: 16a4bc521869d9eb0da28f725a4cb75f929b0ca5 SHA-256: b549674d45b3ac9d256b491de927fc16a9a9bec82f0ed3f4e387ed391562ab76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous unknown URLs, many hosted on compromised WordPress sites, suggesting an attempt to direct users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a tactic to obscure the true destination and leverage potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/affcc1325afc077416aaea4e02f46155/kagabolozigazikodaju.pdf In PDF document text
    • https://aplusadvance.com/naver_editor/data/file/68792934480.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/67842933318.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/51146959235.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8f4389c72a09478a5b001258a0edcd82/36626376397.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b5ab1b560---10714741181.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/51087747933.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/22244905931.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/wipuxojegukis.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07f5f677ad---kumixitusekavelidu.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cfa0dbb17---joxomofadumajodaxe.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/rb8q6os4p085h1aoa45cspmj54/1670363559.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2b2bdbe2c8ac3e23f78e98b1065314d6/78476542656.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/44576b37c383cf59c672a03b27525eb9/bezejugavefab.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/pumabvcscjgr9kut4odf3i40ap/50564265959.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/04f062325c037a98b24003efc8f788c5/95398187981.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/fesetisex.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/12719027218.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/63581487059.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210616183638_2096939263.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/juferiwar.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0736053001622963989.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/xozonasulemanuwexemukurux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+dry+meat+naturallyPDF 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_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 17804 bytes
SHA-256: 54e7cf390b1fc63a95815af85d4bbb0714015f01c18dfbe6c91ee35e54f6d6c0
font_01_sfnt_off000121c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DC 10440 bytes
SHA-256: 08699f2b478f9c5b6aaeb2142d532526b2eb001746cc50ada155067eb9ee2fbc

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