Malicious PDF — malware analysis report

Static analysis result for SHA-256 27250cdad82cda2f…

MALICIOUS

PDF

91.8 KB Created: 2021-08-12 01:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 753a7f084121cf0aef11e33157e1a77d SHA-1: d6d8a8b91e1d0eed65cc48c2badf44af0f4d576e SHA-256: 27250cdad82cda2f3567ffb5fdbbe88612eab125845654b361e9ec49758e972a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the overall structure point towards a T1566.001 (Spearphishing Attachment) attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=what+time+is+burger+king+breakfast PDF link annotation
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160804e79e2473---kupenoputebotubatolax.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160702e643fae6---46056870904.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/nigasokesogowefomiton.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/tofuligelosinotafemeji.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/jizowalukujanubawunet.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/36beae4b308e11a4e61ffb7d0e9a7650/zexivakalugozepi.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/jituzuxatedurabuxijof.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/gadanutajexolefetiganot.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/6735416107.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d976718f71a---96937933042.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/313c7c1958c0291c5ec0ebfeead7b263/wikazidoxuweravekojidota.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a62cae185---92958532540.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609de06b84a2d---dulebejilepujadab.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/zewajonawufokewuz.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b93d1c244---32165069372.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/wuzejeketaborif.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607314d857bda---23552298697.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160acc098b61ec---rolekezomodifukujejafel.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ce54d1762---sasabewajipobu.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/63975410675.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/44324446784.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/1752137084.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/77699479802.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2de76f0b2---bapopipolexolavavixiwi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB3 1236 bytes
SHA-256: 026f8492edc499c4da439c5ad2154bbec1ad0d06e25fefc44630a1eef4c14acd
font_02_sfnt_off000116db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DB 18224 bytes
SHA-256: ceda2e5b0cd7bcbd7f8c9cba6349e6ca0d74f12e4708495469af78e9bcae631c
font_03_sfnt_off000146c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C3 10820 bytes
SHA-256: 41df624fe5769036695556a54c35217f4a3101ccd50889ab709b5c835c2ac40b

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