Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1ac04d7b647c37…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 00:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f46b7a54617684e989acee2bb8dfa31 SHA-1: ab67bbf89555c4af1f3ec32f69b710585bda0c6a SHA-256: bc1ac04d7b647c37e6a9e587def5c0de925c0450062e78766032b99965756af3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ef49c7ee7---pukapepuxutiserubejofo.pdf
    • http://hurtmar.pl/Upload/file/42451872170.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f309df2307---55509562284.pdf
    • http://oiseau-bleu-morzine.com/userfiles/file/16774320941.pdf
    • http://emaaravm.net/upload/files/ninumevako.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/90502849088.pdf
    • http://sarica.com.tr/ckfinder/userfiles/files/49691461596.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7884278c7---dilat.pdf
    • http://wabasnb.com/files/fckeditor/file/1290547974613af404e39bf.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i3811f1bga1sn2jqi8oqrjiek4/nebavejenat.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/kisukenuvevatikos.pdf
    • http://centonze-vini.com/userfiles/files/95527533715.pdf
    • https://tenekedjieva.com/uploads/file/lunowaziro.pdf
    • http://tranduongauto.com/app/webroot/files/images/pages/files/remoregofudutulaxozazawi.pdf
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/vixujagetefitixotupo.pdf
    • http://peter-scherer.de/userfiles/file/55945923354.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f42807bd42---75766457185.pdf
    • http://studiobonvino.com/userfiles/files/69094463638.pdf
    • http://pnlestari.com/visitbali/image/files/vavisumirikemukagin.pdf
    • http://zkqzl.com/uploadfile/file///2021090911334216.pdf
    • http://a-daily.jp/app/webroot/contents_img/files/parivisopawerifi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=two+countries+malayalam+movie+online+free
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b07e.bin
5fffe6770e9bd08a086c0ef0963367f3405016197bbef12c64c375a5f6d62826		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB07E 17672 bytes
font_01_sfnt_off0000dd8c.bin
9c6bddb4bdb8dd0e34cb7978502375953011218f82b479c89ba0a9f55f43a991		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 10824 bytes
font_02_sfnt_off0000f6aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AA 16792 bytes

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