Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7c1a4bfe88592d…

MALICIOUS

PDF

90.7 KB Created: 2021-08-17 11:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ba58b93f883bd8b2688eb7cd67270403 SHA-1: f54dd3ed7f1c654366edc3dd9deb370f86cfe43f SHA-256: fd7c1a4bfe88592dba0f13fac581f822b1cf066a66b19dd61f8d04f757956163
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to PDF files hosted on compromised websites. This suggests the document is part of a link farm designed to lure users into downloading further malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://samudra99.com/contents//files/rigisilo.pdf In PDF document text
    • https://dichvuketoanvn.org/uploads/files/bevimapapuweba.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/jowexekodepibode.pdfIn PDF document text
    • https://krossi.ru/images/content/files/biberoseluwibikaxadido.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/5b06b2e84221af7f046495dcb9538703/pazilogafuvus.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/da843b79ec8a9f3a30f69fa377e10093/pevitexogalowodumesuwiba.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/27380144616.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/48801909245.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/50760430324.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/p4bjfibabblekm337avmtep1o4/juvepuvile.pdfIn PDF document text
    • https://kawanmto.net/contents//files/64463172310.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b05b2f36362---dafuzulat.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/13887119790.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/vejujusoxosipuxe.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/53673224040.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/87ea6da9b309317a86d48584f24e1036/laxugolubovugomuzinopiz.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/96748886971.pdfIn PDF document text
    • https://nevisnews.com/userfiles/45688657278.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/32601933290.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/bulixipovaxexuniwo.pdfIn PDF document text
    • http://didula.com/img/file/2449369995.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a38329d21c6---62528558188.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/wimimifasijigupizonejip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=2005+harley+davidson+deluxe+owners+manualPDF 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_off0000e735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 17024 bytes
SHA-256: 83d4fbbd376505007c6e388eb7ce0dcc5bc7f0f65a0043f6e6ba1b657da1999a
font_01_sfnt_off000113fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C12 11160 bytes
SHA-256: 75d1d3ef27a44090a4eb990471159a52a5abe8015952d6a9b63ac83333885792
font_03_sfnt_off00014610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14610 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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