Malicious PDF — malware analysis report

Static analysis result for SHA-256 82640a05a458ad3c…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 06:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: ae0f80ab843ae876f3e2229854bd8e10 SHA-1: b5363d322dedd6ba4d8468b359b6099d38c2f3e8 SHA-256: 82640a05a458ad3cc76cf4ad116bf62860b80471b0a117481a9c43e63ae28a22
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload sites and other disposable hosting domains. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=tommee+tippee+electric+steriliser+manual PDF link annotation
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/1b1ec520ffb7d850b75ade18da2a3dde/sodiki.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/53953601596.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///83237865287.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aeab2c3c911---52641117072.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b236e3da4e1---32976353237.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/8582454936.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609685f29030e---wegufaxudukegovavoxowi.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/45224552770.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/9327618482.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/80193149358.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/2940328992.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c51c698cc---36405243769.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606eab54744de---zupanogevu.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/iuo9455kgfdnjv7v91spted84s/komakituzaw.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a992a2ec8dadd49834a7c22fcfe5555a/23233724586.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3339234f1---pelulidezopuw.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/42303443089.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/48081201330.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706f38d99bf---87560333433.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/20914923082.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/86357148468.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/fhcepikp83ckk06pqjmt9pp8n6/genasu.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/jawudexeneg.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/eaa0220d8ed837076fb28df400225214/tululebaroduvuxokirifet.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/wuvotudigovufelozumeta.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_off0000d0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 17124 bytes
SHA-256: 1fc8a81f47abf9cc800d2cced5b7b6b3dc36e1f29d66e06f96264417caa24bbe
font_02_sfnt_off0001151b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151B 10600 bytes
SHA-256: f6f871c93f4c768fbc3fc39c7560b0217cf8cd8e784f8bd15e377a71d0cf33d0