Malicious PDF — malware analysis report

Static analysis result for SHA-256 7753384b2d84923b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 20:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 71c6626ff80ec88aa64ba44878e44660 SHA-1: dc1f31f7f39c672377e9a50d05c71f468c29b4c8 SHA-256: 7753384b2d84923b86b7a906bba1503d0774600db52e0c3072109acfc8ab4ca9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The presence of a 'free to download pdf editor' lure in one of the URLs, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicates a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL analysis point to a malicious document.

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://contabil-fiscal.ro/mm/file/subase.pdf In PDF document text
    • http://kredoteka.ru/uploads/file/83344238074.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16089d275f2cbd---zalapemewasewa.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/pelelideza.pdfIn PDF document text
    • http://turnyras.lt/Files/file/pojovilo.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/785ba730b9e6562605814eeba519af6f/lazamakejugiwibilesiwovir.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/92190abf6a3de23f8062b57ee33ed340/fulivoxa.pdfIn PDF document text
    • http://medrea.ru/upload/files/52967467176.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f36aa0232---19984993775.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/nafotutuluwonowe.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/relapabetanijafel.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/42163058210.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021062120452526.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82b9f6b115---velijine.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/kivoronufanokawolabe.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/lasajepijab.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/k5bbms26sg1o1b4qglhk26biv1/14488022739.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608256cc9775f---41338139812.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7af25576a1---midojuvisiwinenubexodu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef41952fea---28424809183.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/nivudowupa.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/wolelusokigegekagitar.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc1c8d043e---84737761264.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/87450335085.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/tafatezovawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=free+to+download+pdf+editor+full+versionPDF 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_off0000e56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 16664 bytes
SHA-256: 8f87d95c7ccd6e5669ae7e08fca677fbd32adb4f30347d71c73ff8dc863a5a24
font_01_sfnt_off00011049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11049 10720 bytes
SHA-256: 2e4f18c9698f39e9fbff0467e36543104957dced7fc4e6b335c47ea6f7d60327
font_02_sfnt_off0001290e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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