Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7e1ab3e068f37d…

MALICIOUS

PDF

76.7 KB Created: 2021-09-05 14:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e106eef099b3c4116a2ea0673ec0fdf7 SHA-1: cafa188e4e9d8fbee797dfa9790f4511b0bd0528 SHA-256: ff7e1ab3e068f37d731406eac43355b23ca65e7c443424679cf200f0db650cce
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allier.proximeo.com/ckfinder/userfiles/files/16751746205.pdf In PDF document text
    • http://sz-nuoyi.com/Upload/file/2021072020312136192.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/54406799326.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612871ad75909---69789172104.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/45497219263.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210606035237.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e635c997f---komuxixufinemilukes.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/27845470717.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071aeaee9c1b---davaxidiba.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/nubupadagotozunuluxobawuv.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba31441d3ed---tikosekemaginafu.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/bugusojazisagogesopowusep.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608aafd9497ba---tawalumux.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a800d31281a---21805355445.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfd5736545---zudivuwul.pdfIn PDF document text
    • http://hzqzg.com/d/files/borerevutu.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/53882758017.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/dutofif.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/sufudurapepelate.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/8193787672.pdfIn PDF document text
    • http://2440027.ru/upload/file/velukadix.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/75200800170.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/liritopugewefolofabode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=torrance+transit+line+3+pdfPDF 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_off0000c578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC578 17924 bytes
SHA-256: 491d388aa668039ae587c2ba9b911a25d0bd4af0be8555a155f70a89b909b18f
font_01_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 10748 bytes
SHA-256: e138c11f7ef7e31d2e964e864ba0f1d3f256dc14a5a4cc2cb1b76083c5ba2aea
font_02_sfnt_off00010d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.