Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f6bf2414f31b6b…

MALICIOUS

PDF

87.0 KB Created: 2021-07-06 13:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6cd3ba8e4d541c9c2a8dbff3098b87a4 SHA-1: 211d5a48311aab203863a01a3bfa4428c1563a20 SHA-256: 36f6bf2414f31b6b8507a132dcf1bac49ee8f66ab6445350f09c326679710395
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and an IP address. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160997edecd3e4---85914793609.pdf In PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608251dc3c058---91077417095.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/jusogu.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/fr5k39qhqnecmn4rnj4gv3upbd/murekamemivajexafogit.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/177c445c5f498c47657101132293be95/rukufufizevabarewulewa.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/5037535163.pdfIn PDF document text
    • http://wenxuezj.com/images/File/54450282442.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-4/20210504180145353719.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16071a8e0011e3---pebapiretuzeludalezokul.pdfPDF link annotation
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ha954ms1t6vdkhokmb2m5v3d6p/76777382177.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607893e62470a---bupaful.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/gelowaxiva.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/141b7c50384da61b94e953c76d800a96/fomemaxexadozi.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095c9e05116f---lumulefopitoralazi.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/0qii11mrv24ibpsmhmg82l65a1/37118075800.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc68fb73c0---dopasivopogipetenoregux.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/98c3d1443af85dae96c410d62f382386/xadapokegodowirazunij.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/1757520600.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6f851ee50---26543635121.pdfIn PDF document text
    • https://digicpictures.com/downloads/kimewewikivagogosilavo.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f0t3ti3vdvbk354dmlutaqs73/lomexijede.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/75392880580.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a4a4d8dfd---58820378038.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/105b45cffcefdbbee898ed777d58f83f/26696045620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=child+pees+bed+on+purposePDF 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_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA6 16892 bytes
SHA-256: de2e64a1daeaf267df25f63b359e264887601c4205160fa7f74f4957efce696a
font_02_sfnt_off00013779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13779 10500 bytes
SHA-256: 973df1476e45036c2011fcda50f9719624bd69637a6d61567bfb0cac1ed59877