Malicious PDF — malware analysis report

Static analysis result for SHA-256 284632e37a8e83e0…

MALICIOUS

PDF

81.6 KB Created: 2021-07-15 23:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8604e3f776005ba632c002f71ff753ed SHA-1: b664907a833ba1997f913683b35411e6271cd9af SHA-256: 284632e37a8e83e01ea288fffd562fee7b9736ea04090df2ffeaec9e4dfee37f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, directing users to download files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing payload or other malware. Although no scripts were directly extracted, the presence of numerous links to potentially malicious PDFs suggests a downloader or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/43c6ce96c4a587fc6ebe9399dc4d8117/kelike.pdf In PDF document text
    • http://ylgems.com/file_media/file_image/file/vufalizi.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/0ef517767abb75fdc4f02779b622d8b2/76025282940.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/kqcs3j7ula602vs967lkobgubs/35567650476.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ukjp0sg44sb5d98but6vf4gua5/zejiripekubawedubigumino.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072a9713f971---megowik.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16090174a37145---99682299380.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/8mf3em6o6gdogqgce8s28fkhcp/tuzuninu.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/23089592178.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gtq9nh03r9i4b0oecqugd617im/5920894417.pdfIn PDF document text
    • https://bczenekar.hu/files/file/jaxazumaxawekixotero.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0476786ba---16135386824.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b7bc48809---50747105119.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a626255b639---wokasesogewuwujupufid.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bjtvcgap4f4f31kapa7lmmco96/fimetufukoj.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/kfnt6jbo8skpoq7remqqcfjr6b/10516515932.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b55168ac1e9---zapidadutasufuguzotekaxi.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160921fbbd476f---bipekavawolefegixuwewibor.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/38737111178.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/manefokenupakezoxus.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/lb8kfmmacd3q0bpvk82ltr4sr2/61119959683.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/wimebazazogekopoxonareni.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4cadd3525f04be80c90a5faed8cd063a/zureturifenopowugalesika.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/6de547e7df42866e2575a67c84ec763d/40235047607.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/22c7fb29581a7872263b044f19ff5901/82662499687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+minds+of+billy+milligan+free+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C1 11064 bytes
SHA-256: 6d872d8d9647d0ffe62f27e613650dce7a70cd5573447cfb627154c454b8faea
font_02_sfnt_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 18852 bytes
SHA-256: ea673142001ca2efaed1f9919ac61747250e1bfd131cd840b0e800510194f200
font_03_sfnt_off00012a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A51 3584 bytes
SHA-256: 13dbf1973f9add5ccabdf0cadd4c5e5cd5db718a0bae244d5cd718e8c71aa58b

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