Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc06adc702ac1e5c…

MALICIOUS

PDF

75.5 KB Created: 2021-09-23 06:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4d6cdaa4274b63dcdf79ff23a1f7095 SHA-1: 5a73a6c549a6a263d38f8a92c74dddc9a1bf192e SHA-256: fc06adc702ac1e5c460354898e10585a0ed1c44fdc312db9c7dabfb0c51830d5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The presence of a callback phishing lure heuristic further suggests a social engineering attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://chcial.ru/uplcv?utm_term=download+ghost+recon+breakpoint+android PDF link annotation
    • http://kammed.com/userfiles/file/48560952407.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/64221705143.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/48af91eb713a44528003dab95135c850/rirakexot.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/xomagagobudavafonixi.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/liwov.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/89729740642.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/48751761159.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/pofenilew.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/36539985918.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109120604245826.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/53601217548.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/54217212444.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/ropefodafetipi.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/81174465814.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614932bb4ad74---kejejuxokagebarak.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/32616166126.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/25256709946.pdfIn PDF document text
    • http://xsteelstock.com/d/files/38943333980.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/879049196613253c898ad7.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f88a61e6c4---gisedovozurumemiv.pdfIn PDF document text
    • https://subded.org/userfiles/file/forijolofot.pdfIn PDF document text
    • https://dol-rtknetwork.com/uploads/files/76777732251.pdfIn PDF document text
    • http://fohow77.ru/upload/file/8909916308.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/hdverg114db9ul58d4fp39m1fl/gukerafibivonimibeba.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/18883336980.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CC 11112 bytes
SHA-256: 27777a0de42c418198de34e6a7086a53bc998898f9c708a7a16bce67c81053bf
font_01_sfnt_off0000dc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 16872 bytes
SHA-256: 7279251b4219ed5022a3c437a670e370d0a90632e94fa95ebea56bdc0884ad5e
font_02_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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