Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22d9c3b9eeee6ef…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 14:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dd1f8d1c93c9c9e1747513cd47cb8713 SHA-1: 02de9c6beb68173f098eee9875477a7f7dc65688 SHA-256: c22d9c3b9eeee6efb26702131c7569687c5fbea2418ff78c0a3c8ba34738ab83
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. Heuristics indicate a link farm on disposable hosting and compromised CMS uploads, suggesting a phishing or malware distribution lure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://cructi.ru/uplcv?utm_term=helicopter+simulator+mod+apk PDF link annotation
    • http://zrdb-drogbud.pl/Upload/file/74450182846.pdfIn PDF document text
    • https://uangraja.com/contents/files/99658359244.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/5929175396.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366709d345f---55871807385.pdfIn PDF document text
    • http://nemochem.cn/upload/files/43044449182.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/dbc68bb5d03f043f910ac962490c21de/1807496629.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/81060139525.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/bixejukodazozabukisebovog.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/63581233585.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/jarij.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/18951812762.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/11902129180.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c85cd4bde77562fa2c5c43754dba20ea/kirutibumutuxuj.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/sadaremanamiwowikeb.pdfIn PDF document text
    • http://vejwun.cz/images/fozuno.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/movuxog.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/25904986832.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/50390146696.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/11322648661.pdfIn PDF document text
    • http://ranchobg.com/img/file/90168706625.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143fbbfb5401---venarosozijodetivepipufus.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/10043994899.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF4 21560 bytes
SHA-256: 2a0fab023679cac8e40505da2456be205604de12a58398800e81d148e6166807
font_01_sfnt_off00011408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1F 10752 bytes
SHA-256: 273cb3f4e935f9044ef77eb251b367602ea8596200f71bf2ce56b982bc4792c3