Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdb38ca5f38c72b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 14:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb178913f1c2e8f565dfa6652b51b30b SHA-1: f06d6c15ff90cd2479b8467198f9f4e1d474385b SHA-256: efdb38ca5f38c72b4c09a4e0ef1c4e5b3ddf028abeb4cefcac54f10ce7dd69c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://rococosofa.com/files/files/30481527478.pdf In PDF document text
    • https://betamachinery.sa/other_files/File/rosigifa.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/81348158152.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/dijokamisorufivon.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/54854063050.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/1d65f406694d8b53b9158ba5903c417c/42727427378.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423d72c55ce---59629011533.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/rexikejexuninipinexapub.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/lugunexesujawaza.pdfIn PDF document text
    • http://nineslash.com/user_file/file/32648211571.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/18085140476.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141233e80fea---vizufepef.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614556fee1212---8385655177.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/i9rake0hqi481de25v9cc6dnd3/gadonezajigebonerojadenag.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/bidum.pdfIn PDF document text
    • https://webaprint.be/img/file/tabawel.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613521a7d9ed6---menomububafik.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/fezurupowesapedibu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130071d29a9f---wonik.pdfIn PDF document text
    • http://moretonassets.net/userfiles/39994726164.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/44454625210.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/savujirumekupobikarenoxe.pdfIn PDF document text
    • http://juha.be/_files/file/49622734128.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/21922358382.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/39542547516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=naruto+volume+1+pdf+freePDF 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_off0000dae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE4 17788 bytes
SHA-256: 0e8cb3d9b78ceac6b5a48504c36b16a232e3cb640a05d5746242a617163631fd
font_01_sfnt_off0001092d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 10492 bytes
SHA-256: 6a3ed4bc6326e51199d962eb2c872807970b96f869e830905131dc8702f9b2c4
font_02_sfnt_off00012127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1