Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e74636caaab502…

MALICIOUS

PDF

77.6 KB Created: 2021-08-22 06:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 66bdddaed32d621913199c7ced475b92 SHA-1: 5bf0ff631df5e00c37d1577b46c5846751239294 SHA-256: 89e74636caaab502672cfca321c83613265f727ee65ff351bec4190216ba6438
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or scam lure, likely intended to lead users to download additional malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949ea19867a---32917850415.pdf In PDF document text
    • https://stopserv.ru/files/file/45012899321.pdfIn PDF document text
    • https://salonrewards.ca/images/file/fibejulat.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/74067052208.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/jmdrn976a5shts6nr5ebh592o2/kudugofobinofapajetoxeve.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/simemumomilokipobixer.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bb895bf84---36465655105.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/xubakejanovanir.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853bf35d672---27247466012.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/15491590644.pdfIn PDF document text
    • https://davaocarrental.com/images/file/28701958854.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jupozekagiz.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/54b5c357e91a701eb427e43d4d3676ad/zedipujom.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/65793894950.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/vewewomareperixa.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088aa7659878---ledobegujajufiza.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/71423592771.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b51cdc8f0de---rawituzawarolamuz.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/aa4b0d739aadfaf7f5bdc27ed146014d/xoxudezojubapa.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/69e6b44bee864d3082dbad41c9e97e48/5268912156.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/34645275032.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/riwebapinuvapazemevevif.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777098e5cbf---3722947991.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607edf488c592---bewivadakinifiji.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/xowekelagajagefizokuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=100+times+table+chart+multiplicationPDF 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_off0000cb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB57 16092 bytes
SHA-256: 0803f172ac79ea8d464287e80c3a802e754be4f1f96a587b786792a86f8bf496
font_01_sfnt_off0000f532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D49 10956 bytes
SHA-256: 54c5944ddfa033e730153e789aa934d21b766c9ca60ee1bf8a815e56562c9e43