Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b72d5511725cd2…

MALICIOUS

PDF

80.5 KB Created: 2021-09-07 21:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eabdf3e9cf82fd74e8929440ea4f57bc SHA-1: 7afd5de05bc0fdae88e2953d51173613d980382e SHA-256: 91b72d5511725cd28de324e74a4f81b3a9f5b04a916ee23aac3d4b3c51d1471d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised or disposable infrastructure, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of malicious intent, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tjpapigroup3.com/contents/files/69901096068.pdf In PDF document text
    • http://erdivigado.hu/userkepek/file/21378031652.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aba601699f---97309822031.pdfIn PDF document text
    • http://secretinvitation.net/images/files/35841266272.pdfIn PDF document text
    • http://4darchitecture.org/img/all/kifulezadiviza.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/49980006568.pdfIn PDF document text
    • http://amdind.com/userfiles/file/36216555564.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/kusuwipa.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/77619192164.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1254f8da19---wafunonogug.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/2jf5rmmnrf58mnr3qmsc19f900/92435026697.pdfIn PDF document text
    • http://www.bash.cl/media/file/wegelowinesus.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e575d222672---80147866365.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/53231342404.pdfIn PDF document text
    • http://gardatrans.com/content/Files/nevupabitumakadejijenakov.pdfIn PDF document text
    • http://bakoca.hu/files/file/lapekorevasefokavim.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/41fa1a09611c3d2a3303f72aedaf2e4d/movodejer.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/55211970071.pdfIn PDF document text
    • http://tencanpowder.com/d/files/zadogepowevozujakifirad.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/96929097618.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/23560440402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=science+observations+worksheetsPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/0a412713d1e816c6321e8020e43e3da3/zunuj.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 10740 bytes
SHA-256: 9730759a235ebf4b49e6c8c8138ed29b96b00f47b2fff66954993fd8853fc450
font_01_sfnt_off0000efd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 17196 bytes
SHA-256: 78a6b46b02b500c6a12642050fc8106614bd9609ff1c0ef755bd3d635ae6efa3

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