Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8bdd4061aa4774…

MALICIOUS

PDF

85.4 KB Created: 2021-07-01 21:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a6442c77152cb528e89b2ace96afebe SHA-1: 818ab93036c2c1e051e13cfdc9c0d5177b3ed65f SHA-256: 7d8bdd4061aa47744b6c182258f1d5afde54b67b5af3d3547ae3c89cae534712
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive links, likely leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ahxxzx.com/userfiles/202105/file/78007886031.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/b0584c021fb0ccd682a35185cbd15d81/68728157795.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7237f99157---rulefafuvagepujedisam.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609843369be97---6882003691.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5decef64b---luzipixokuzofalatilus.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/c35924b788fa1ad810f45e3fcaa98e97/vagebevudi.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d9a292fb---12430411035.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee4569379---metakurixogoxavovete.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b64dd02055---fememo.pdf
    • http://kolasinprevoz.rs/slike/files/5873520430.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/3242b4f533e2348c8f3121c1f001b5c0/zixeronisib.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/5d977f2bcb992358a7c2a27fb8651e6d/dateje.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c41bbdd60---74663849008.pdf
    • http://mobydick-band.de/fckdata/file/xagiravegofevewajurozaged.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6b66772ff02532a939be5306c739d2fd/65281149757.pdf
    • https://ifbscalidad.eus/files/galeria/files/gorusonezenal.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ed63b0f38---pusofesuguvemisukolewu.pdf
    • http://beiks.info/public/file/89805310962.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3d605ed71---lilizugiwanutomawejemeluv.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/37302885373.pdf
    • http://caratow.nl/userfiles/file/46937245414.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/71202648862.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607535ea0dbc9---nonepekidovijorese.pdf
    • http://runo34.ru/attachments/file/9380179740.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=whisper+of+the+heart+online+watch
    • 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_off0000ea19.bin
a5d9f6552db2c8f24cd23b338e5dd90dcf3e41639df3e2515a38c1ef85f85792
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 17572 bytes
font_01_sfnt_off000117e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117E6 16792 bytes
font_02_sfnt_off00012ffd.bin
69fce2201affd00c895985910c344473e1068daba5bc3e5fac7b1962ce993b72
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFD 10656 bytes