Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3d34368b31403b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-20 07:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86cc67282286a4746a90df2407dbcbeb SHA-1: 22ca6acdeb92a4448bb35adad8f1d1a970605ae9 SHA-256: 9e3d34368b31403b2c785d5a9b36a3cdb730153644aa48122fdf5d3df6e237d7
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various websites, suggesting a potential phishing or malware distribution campaign. The presence of a 'download button' heuristic further supports the lure aspect of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/bc50cf69d869871e64b6250bbc092841/lelefavitojofafepodot.pdf In PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613db080f2662---62911645708.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/xerijuzegevete.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/26874652116.pdfIn PDF document text
    • http://keacg.com/upload/files/juluge.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/telitivid.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/5929e41e883242f7dd15802d32c01eaa/dakodegop.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/doliberatenipopadel.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-8/20210908060256226108.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/vinid.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/39291280392.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/zebofidiredusezefinu.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/14532871712.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/7860284885.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/wobijedejusakiritapabadov.pdfIn PDF document text
    • http://spbi.cz/res/file/74935999515.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/81694404064.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161394f2027786---fotinigabased.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210831174419.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/busajububutitisipa.pdfIn PDF document text
    • https://bloomeng.com/uploads/gilik.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/41139927549.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/48420301826.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/48a52a53f68d4f5f6327bad17090f74f/liwuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=macro+mobile+apk+free+firePDF 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_off0000cb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB35 19768 bytes
SHA-256: cf44c86e5c3dc1a7941b1577af1779e3cb90799fe7ff01ea5692816bc368313c
font_01_sfnt_off0000feff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 10496 bytes
SHA-256: 3db7c3c373972c814b1d1ca0eb1f21ce09b0cfeb52a25b379fc74eefd2c2bd37
font_02_sfnt_off0001169e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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