Malicious PDF — malware analysis report

Static analysis result for SHA-256 23cfab300a815f07…

MALICIOUS

PDF

74.3 KB Created: 2021-09-06 07:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f21535133a81ff4422e48fcd529484b SHA-1: fc904a1063ea359467307e715d910d4421f438c3 SHA-256: 23cfab300a815f0762e92568d27417d9023118a1d40e83f55e1943f61d6464ae
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=low+pass+and+high+pass+filters+pdf PDF link annotation
    • http://debandhelder.nl/ckfinder/userfiles/files/pixilovomazukad.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a5877831801---mibutenozavevuta.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/15310491782.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bba478ad9b---gelovivo.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/patajaraj.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/tigesafalilo.pdfIn PDF document text
    • http://15881588.com/ckupload/files/44606815848.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f680c97e5f---fomanuvelelipus.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/1u8etal1mj5g4o9oi364ml4c9i/fodigex.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/45416061875.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1b4a9a6ad919887b167aa4c52000d3ba/riburizupitiditofogedupo.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210806155944112.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/89843214285.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/vekajojulokufanikajexo.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/9269e939014cd2d738b174b634b0172b/89756423262.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fd60414d77d---92772908199.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3ff9438d21f08cc8e0bc1dbd717d7b72/topatu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2484d116c---kogonupawozuvugagax.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/70046099403.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/17472365435.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/xumosatixizojati.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/filululukejozovuba.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/57188784286.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_off0000c157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC157 16280 bytes
SHA-256: 6c014bab34f1d19f78b4a2c24d46870564fd8c3a306d067fbc578b98f69bb7ff
font_01_sfnt_off0000eae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE7 10820 bytes
SHA-256: 3653e1a9cc3a54fe275f21c4c14b0c2623638ff310477f91f04896478f55eb25
font_02_sfnt_off000103a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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