Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea72a6d7c4d584b…

MALICIOUS

PDF

76.7 KB Created: 2021-09-12 03:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 52d4288c6ca18972e7635a059338cc21 SHA-1: 3bafc18e0d0517e6279537674f9a1639bb01a3f9 SHA-256: dea72a6d7c4d584bc0405304d975b668ba9a3087fea92d7e2f2ede968bcc7ed9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://allytemp.ru/uplcv?utm_term=easy+security+apk PDF link annotation
    • https://mosallaesf.ir/uploads/ck/files/65297046823.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cf56acb30---genukilisuvodepiruj.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/24820497924.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/85462000962.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/jatine.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/fosaxolekuwemigepebixeno.pdfIn PDF document text
    • https://dellrein.ru/content/file/79777490226.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/fumugojadogijitasu.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/pokimu.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/43688673416.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613644b4cfc29---23874836451.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6r4inqm4t1f90hv3vj4f44mgb4/zixonutesugoxesoxod.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/dejojixur.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/80452656521.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/5078909471.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/1ce06330b44698bdde87d640203dc2be/58505120774.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/79431459819.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/valavovapukovumesotilimi.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/moguniduzumosalejomi.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/21451597052.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/84046056307.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090504571573499.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/putewufogadoxexelelivono.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/goravufizuk.pdfIn PDF document text
    • https://funke.be/data/file/72453045739.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/kunaxesitakufobe.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/wojule.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_off0000c41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41A 18904 bytes
SHA-256: 89f126e5a39ba2d6a2552a255edbf3dae4394c647d7f37898779760cb219c858
font_01_sfnt_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 10388 bytes
SHA-256: 01fdbb1fc1566f91177fb49d90775374fb2d18b89de0d144a0ec899b7ea44cca
font_02_sfnt_off00010cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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