Malicious PDF — malware analysis report

Static analysis result for SHA-256 9170d79d72f32bcc…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 07:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 56a18c0b0af481076ae29b29fa6a7e01 SHA-1: a598359fd47787d322a35875de75d9b860b8075e SHA-256: 9170d79d72f32bcc3d5a83806b593dc9235fb21445be263af918e135e11f4d30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or utilize disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=aol+mail+login PDF link annotation
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161404b08808b2---merefomidu.pdfIn PDF document text
    • http://electric-kernbichler.at/24108009816.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/sopamobixubi.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/4521940224.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/83729960471.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/nafelifudibubaxu.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/kasafejuru.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/79823987133.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161317eecf347b---10507124046.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/52334471151.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/panegewuganakepuj.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/xezofipekijunukekinezed.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/ziwanatavegewomodarugu.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16139c716895df---femedagojudub.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/45092691286.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614494b863b1e---monawufuvikolafinejuza.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/22744419174.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e36b720871---gisagaparisisarin.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/fesubi.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/piganaxilusivuwo.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///vixanujewidepoxudiredoje.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/poditaxefinesodegekazare.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/71384830465.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/fapil.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_off0000ba70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD282 16652 bytes
SHA-256: 5bdc7b7e8a981fe42cdef7e6dc6d6526dd6e58de8d080f67efd1378ef012a377
font_02_sfnt_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 9936 bytes
SHA-256: 231d46aa8efa41632464cfd9c611a2a08fe326c68dac1847cf6fa95ddc388eda

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