Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ced7b9a507435a6…

MALICIOUS

PDF

67.9 KB Created: 2021-06-22 13:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7aff6148545a64e2d96335ad5df59a0e SHA-1: b7fd0ac84c1c3430dfbaba70b617b6913abe30b4 SHA-256: 5ced7b9a507435a61f6ff452836c5717282abf2f717d0d756216596d263691b9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The document body, though heavily obfuscated, contains references to 'star stable star rider codes 2021', suggesting a lure to a potentially malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/e61scpgerjoghoiljovlqoc6s3/pasilebexazilenozosi.pdf
    • http://canadanur.com/resimler/files/81733986961.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/24324746350.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ii8684fjt056vc0c8ilng8ttpn/38349013296.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/c3770c316f2470a9ea447216ecf5c78f/14274073821.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdb9810126---97404759044.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b06997897---wadovepopemaponij.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d5df262a4b96dc7cd2495c081701d5d1/48002348329.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16076d7d125fa4---xijemudokofujigomadeko.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf18de84fc---vediwudowuxawosewazowes.pdf
    • http://teraval.cz/res/file/mezotixamibejasigupifi.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/89010025376.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5cd5afa44---48809611880.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ttjsjvon0jkng0fu9moh4hq7i2/rutulomipomab.pdf
    • https://bawwabatrizq.com/userfiles/file/31865680786.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=star+stable+star+rider+codes+2021
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bea6.bin
de7817bb012a2e79505e619cb7052ed05b3dbc5d53c2bbcdfa5cdc185b71113a
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA6 5184 bytes
font_01_sfnt_off0000d047.bin
e5b4a288222ed4d06d2a11335dd05d224b73541a621df54998bfa38f0bd97723
pdf-font-stream PDF embedded font (sfnt) at offset 0xD047 10684 bytes
font_02_sfnt_off0000f48e.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 4324 bytes