Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7cc47485c358e61…

MALICIOUS

PDF

69.6 KB Created: 2021-10-02 18:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 570a071c1a32fe8b39a9ec8a2861fe93 SHA-1: 4402ed92bd1cef1f367a266e85dcabdeb8c0dc97 SHA-256: c7cc47485c358e61e50a6669e9375ba8ec03368c6b879b1b237770729c21c6ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with many embedded URLs pointing to external sites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of multiple PDF link farm heuristics suggests a deliberate attempt to obscure the true destination and potentially distribute malware or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://avandcie-energy.fr/ckfinder/userfiles/files/nazonebidos.pdf In PDF document text
    • http://gardens-spa.com/user_pict/file/pakoxi.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f64e2d0bd---lozusunaki.pdfIn PDF document text
    • https://ripedesign.com/app/webroot/files/fckeditor/file/49580000911.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/69766193514.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/dupanegiwereruzex.pdfIn PDF document text
    • https://aashianarealty.com/file/pedajamedanem.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/10999275964.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/ruwalubopasomuwilifusuz.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a81815300---peguno.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/6894875923.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/poxuvurudekebo.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6570a3f4b5d35c3ff69d1b03fec3090c/68441720684.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/xosotinefilinorugajigi.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/53511802208.pdfIn PDF document text
    • https://tmtteks.com/files/61576943850.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/40598686675.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/53524470471.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee5fbad7c0---41470281120.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/pifixemexup.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/zububobanidagazaxuvuvoge.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/xowapugilepogafobikiv.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/7503815137.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/kadibemogizarido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+take+vintage+photos+on+iphonePDF 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_off0000b02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83C 15748 bytes
SHA-256: bf14f82d029c35c62796f7287dbc6e3f4629e2ed3fbb5aa4227d305902d44883
font_02_sfnt_off0000f04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 10620 bytes
SHA-256: f2a06848f40843b13a28623be47c8cd73a782042c7a5bec7d1f9a37a4a66d839