Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e61e3c96a9fcb23…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 20:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 03c7d2cff3887fb9e667544d0123e2c7 SHA-1: fb265301f19dd59330de98b40567ab62ede3b320 SHA-256: 9e61e3c96a9fcb239b71d3934242999cb5a46b2bdabfd2756ba5f9cc69da98bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://nbpcpentecostalchurch.com/clients/65183/File/45265579771.pdf In PDF document text
    • https://southwestlooms.com/admin/userfiles/files/5163406589.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/defozidogorugebasa.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/95a2cb7292a0112573d616258d17df7a/12883757162.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pibumebanibom.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/wozukovujalupolekukix.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/kuxebemaretofixasikujuji.pdfIn PDF document text
    • http://mp-journal.com/media/file/welazeti.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-16/20210516134536310019.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/7b9f145a86183dc56b50c8bbf78d466e/93230616636.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/3792f13eslektd3kq102924bf8/lenuvur.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/k9n0ghv6fd66245i6i8keg7k12/81173947931.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609024dbe0cbb---17575784241.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/fevudeb.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/9q8aasqk47e5eflm087cv2atk8/51573965997.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/bajunipawogegujon.pdfIn PDF document text
    • http://hidropro.hu/upload/rosonaxabepiro.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7lg00p51p0sb8tavufe4tqk771/dodexit.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/nosexut.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/499966be50ef03658d379b97812df791/suwifowufizininilozodewu.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081586ab7e2b---pigekixusefudutuwixesu.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/29846e794ab5500b6e329bc525327d54/71766529335.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/kaxavufos.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfd23dd6be---19973188720.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/69822689629.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ae0qg0on7s2g90n4n71ap8b8an/damifuxedisulimeno.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/35604191016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=engineering+drawing+textbook+pdf+free+downloadPDF 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_off0000e116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 10908 bytes
SHA-256: 9681a57ca3e74c67c8d1be35c66f41ff94fe9bfcfd7bd1cb65da0071c8e1d46b
font_02_sfnt_off0001121f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121F 17860 bytes
SHA-256: b2c6e239c9ffeaebc7212633b53ee84ce82978d7dcc4dca7a956f576ada4fca4