Malicious PDF — malware analysis report

Static analysis result for SHA-256 61dae5983e1890ed…

MALICIOUS

PDF

116.4 KB Created: 2021-09-07 18:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4e39b40272263da5781eb157c9a0180 SHA-1: 1d6868cf6d46528433cfdfb643104b18962018c4 SHA-256: 61dae5983e1890ed2b9bd3505aa12e43987134e1e3fb827fbfc0e557e0096a4b
164 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'SE_INVOICE_LURE' suggests a phishing pretext, likely aiming to trick users into clicking these links. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://queure.ru/uplcv?utm_term=benshaw+rsi+sg+manual PDF link annotation
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a14d73b4fea---noparesizubixinedojasa.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/rexowole.pdfIn PDF document text
    • http://enewind.com/pliki/file/83104785758.pdfIn PDF document text
    • http://theettiaresottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/mitorakusigadi.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/39898574383.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/e5aff3ae0b61fc9984e23623c5bb3ace/89993968972.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/81809342546.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/80826362832.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/kavuwowilimufupet.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/xonokitoladowajesakaze.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/13029371567.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/refivebovekukelomitoto.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/11510936539.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/bifenipuvi.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/8fpcjrc1td7eipdqddfvppn3hr/14556889105.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/bq2hm33gk34si4e5vf96of76kh/kesor.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/wolatifif.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ba7d8a48---bejiwuvexewijamajusozalob.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/e3d4d56a40f2b61e2c7cb40123afd171/42573309464.pdfIn PDF document text
    • http://esejsc.com/upload/files/68364446473.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075df2df1b24---voxudesuredolatasube.pdfIn PDF document text
    • https://cardolf.ro/files/zavekejezetanes.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/71954e51ddeead89b9794f1625a8b7f7/fitofawazaxino.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ec52dba54---38930374141.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/65709184566.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_off000163c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C1 18352 bytes
SHA-256: 40a2bb15d5acc1d53774ccbfc34b08a1cd095ba97201a1919951fed5a93d8f8c
font_01_sfnt_off000193ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001abc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABC2 10576 bytes
SHA-256: f7d21b595a5dc94cdcaa0572762023578debcd582515ae4b59e57560e71caa74