Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4460633b82b150e…

MALICIOUS

PDF

75.7 KB Created: 2021-09-08 02:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3733fbca2c46901d808c1f6969fc3ea9 SHA-1: 5adcfdec5d54e203d7357c73761dd67a7de8fda4 SHA-256: b4460633b82b150e201d05028f3ea4a58ded883a8f9ea6ba1b1a71d56203047c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting and a lure for a password-protected archive. The embedded URLs suggest a phishing or malware distribution attempt, likely using a social engineering tactic to trick the user into believing they are downloading a legitimate file, such as a manual. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://queure.ru/uplcv?utm_term=samsung+eo+mg920+manual+pdf PDF link annotation
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/9658b560a338db755bec56b75da2d498/90145478488.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/jisomuvotuvutebafolaj.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/junotoxujumemug.pdfIn PDF document text
    • https://pcstaiwan.com/ckfinder/userfiles/files/zedixesivokufixo.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/98423279211.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/85518806355.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/57457589709.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/437qorqa6ol6j6h6aplealae2d/10156757205.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/dakezarunawuse.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/4817f41e79920fab09df384b5ff952c2/zidoxavobotod.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/02ti3v688n9q37a7jvjuaao8le/mawagazakosatanek.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/4f5svqant71q3ccuk5jlaanbfd/tesinej.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/widinava.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/94319382799.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/lewexolixotuleba.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/4912276bdb097c17d5587022bd3a8056/rumulinarusitag.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/gasuwik.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083b3303416b---39815456766.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/nutoxepifezavugu.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/242778cc78823c1c718e5d857bbaf2e9/kadekenifesazela.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/pinokeju.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000becf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECF 11136 bytes
SHA-256: 4e64e660f9d9a38f33cab4ddd001048e44ca6e2eff55b715774886d0e16f97a5
font_01_sfnt_off0000d89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 18828 bytes
SHA-256: fdaccef476cc2b4fde3da2af4c4819a4f402363c90c08701222dcc8263d7978c

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