Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b1fe2ccf3a0019…

MALICIOUS

PDF

81.6 KB Created: 2021-08-16 20:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad386b0121be441b2ab774c9ec2408c8 SHA-1: a9ecf560d47681a106960882034650b685504567 SHA-256: 32b1fe2ccf3a0019eeb44887b325b34b14a0ff444ec9d6fcb2980ea99f0becd6
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly show a link farm designed to lead users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gaziemirkentkonseyi.com/upload/files/gubimupufubijoxokugowa.pdf In PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d929e7bbb1---24613116612.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/wixujiwugapani.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/viwajusipemudabajuxikado.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/volenenawivutelus.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4d2f57ad8---fofaxofebafotiza.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/e239acca78e3d2cd9f6249387a8551c9/vuzexeraburinoxuvisuputa.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/623ede271c142b6eaf9e83aaa18d8220/redulodopi.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/pavokudubifeg.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/vmsb19k19hd7cd08r7gs0o5j82/fogilumetumomitonibifewum.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/pbhajqbm0oe7kg6k88dproisiu/82643155858.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/6579381c66e5c2797ebdc51a08c43f0e/65698114259.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/29925970057.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d3ec62f41477cc1d6fe5573783fae417/bipibeketiratavewesimikig.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/12726926921.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fbd944b843ecc8c51316c429eacf67ff/16790668473.pdfIn PDF document text
    • https://designclarf.it/file/70546058510.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/wugitozoki.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/xenavala.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/39625576137.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/sigapu.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/76241470357.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cc6fdf68a497b228310c14ec8e77cf48/85148697068.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b888615049e---6230847168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=addonpeds+not+working+2020PDF 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_off0000de84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE84 10760 bytes
SHA-256: b55479b56f75562cc966fedd72238f80b6d9f156fbbe1e0386b13f1482ff61c4
font_01_sfnt_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 16340 bytes
SHA-256: 2fdd6548333e72c648b74fe566c3b5600ea2745341453cc9de8675e43d17f6af
font_02_sfnt_off000121a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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