Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46e0cc21582b80e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 18:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7df560acd85b46e658d62b44b22136d7 SHA-1: fdf79df81955a8415d7c059bd90b9ee2d6be0fb9 SHA-256: e46e0cc21582b80e91eea0f39e2599f85a299b7ffda425813f76df1d02e852e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The presence of these links suggests the document's primary purpose is to redirect users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mailing.crpm.ch/ck/ckfinder/userfiles/files/jatilogifulanugogivuko.pdf In PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360255ed5ed---kivipukosopelipekafejuxu.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109021315364944.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/79363884604.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/metowajo.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210905130102_1948653394.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/92461098568.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/zarinekosiz.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/43081380910.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/84860945888.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090901460954.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/wurapi.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/renajategobujatipaxaboduf.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161335c7b66eae---21588889144.pdfIn PDF document text
    • http://indel.sk/userfiles/file/lubemutivudedotele.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/nejakaliv.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/88393575520.pdfIn PDF document text
    • https://majubesar.com/contents/files/50827078628.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/namoliwu.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/doxojolojiwowevawiza.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161324956565a6---mirifofuzeno.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/keruxerabapifitisine.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/muwevivebejufep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=wear+os+connect+to+new+phonePDF 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_off0000d837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD837 10412 bytes
SHA-256: 859ea27aef9136f4cb645b1c710bab28b491534cd180fb2cf69dd1f0a77ee767
font_01_sfnt_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 17944 bytes
SHA-256: d098b15692e75e610800696c09b61a15fa8bc707bc799bd59daf975e6bf564b4