Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ba421c8691fa1d…

MALICIOUS

PDF

88.3 KB Created: 2021-07-08 03:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: c77377d18ab2afa6bd915cc140fdcf75 SHA-1: d528bdd7a1c1b06d5a8bbac8dcc54c259f3cc88c SHA-256: 99ba421c8691fa1d34e4064f6ff356de3e68b5456632e41c6ebb8ca7772a05d6
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ba601fa12a2527a9a3e3b2b49de68c66/10167829242.pdf In PDF document text
    • http://stlnsk.ru/uploads/file/95836327628.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/pinukidusuxixajugifej.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/pofep.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/aj3p06fmu5u7uvr76mapedqqd6/56046886132.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/nitanaku.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/sofukewobakujifeweg.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/33785052470.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/37chi85almd5k7nq4jbm0kg8a5/funagulixopopefemo.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/9a03a3b419dba2fb0bc87e7df81b8ace/mopizozonukel.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/50edff61721cd7fb677738a9d23e0929/wovagowabevexibug.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/a4cc58c8111704b213281b83c68ea19a/kusipexot.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/34ipct3d5oj38gfj8ojuudch2t/wogilugekapodam.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/36f7d8c8915b8db67a52e38368bd98ad/nobamixizukewowadijenu.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/0obdtb9b9a5299j7aq01ruc4kt/mibodokaxedewogutu.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/4d9e356d867073dc3613fa270fecac96/70755588071.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/qg73oj6v7gnijcj7mp1labr103/44871341619.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/75434ef7f4f434e40466c85024e82e7a/fomag.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/f0495ba7bf7a23b9c89a1c5d5a9e7aed/27108973159.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16081c10145ef3---52431826905.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/vojamegirokul.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/m833vci2b39hulu7o04g46k733/81975415144.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/6d49e7123479619bfd6671e03a4eb05c/65165771684.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3bb78882a---kabikok.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/9cqau0d6rsi9oi0t64bpjevpfg/24543082331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=can+you+grow+olive+tree+from+pitPDF 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_off0000f3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE0 17260 bytes
SHA-256: 13be120c502a2fb41ad6fbc33b14d33feefedd6bccab0378d337692ac3c9842a
font_02_sfnt_off00013909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13909 10928 bytes
SHA-256: 623894b7aa0744c2646a48e823f70666d495353f4304ebb34a06b38e5ea10184