Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c73c87caa02fd62…

MALICIOUS

PDF

102.9 KB Created: 2021-06-28 19:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: fba3745a53dde41a158bcfabd824aded SHA-1: f4574a189eace86758589ddf727919492f14ec5b SHA-256: 7c73c87caa02fd62d48759e19c8e53c22c2001f6c78d5cebe31de2fb0636687c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests the PDF itself is a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://mdc.ir/ckfinder/userfiles/files/94706542891.pdf In PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/4uekqt30cc3vmlbatrcb27sjd3/bubefaj.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/81922200708.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094833b43280---boruponogubupuzagumefuji.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c733038106d---12232848735.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3cb3731e9---60008923238.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e90ae022fab6fccd8ebc9469091b65f1/38139679551.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/36837613858.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/92cf7d0ecc264446473e670f134ee9cf/xilepubimiwivizibi.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9167527cc---78393690245.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/9j9okfes2o81hb84k5dp8fu56o/xigasuzadirisisupefoxudu.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/5i6lhvle0qrah2ct917s39gpd3/39640963254.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607190297d1cb---bezuremap.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/d2d597ef0655a4b079f06e61c110ac0f/63176167794.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/40195235234.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/2609586491.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/jobedikegisijuk.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/24097186268.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c506bc5c8b---23008205461.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/qeb5qk16tktgg0tf0mj7g1qun5/98464828310.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ranceqiqhhv12uid66ughaoges/22133913571.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/dudedox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=art+of+war+divide+and+conquer+quotesPDF 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_off000132a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A5 10804 bytes
SHA-256: 98d958bbca963c5ebb6c40f60d536e007b884bf5effca1f91143e3b07fd0ff63
font_01_sfnt_off00014b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8A 17060 bytes
SHA-256: 6886211b15f4e7284504f508d7b8fe4f04ac27fe4fd84974d77c48ccb7ddedb1
font_02_sfnt_off0001776d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1776D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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