Malicious PDF — malware analysis report

Static analysis result for SHA-256 aead4d53fe561d2f…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 08:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cc7663166d96de2a0642e6e00bf5eed1 SHA-1: c99985d184247c0570aa794439c23cc8cb4831fc SHA-256: aead4d53fe561d2fcd225497e358c889b85d4314bd8fb80845399361cc9b8e75
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm with numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to direct users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high volume of links designed to manipulate search engine results, often a precursor to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kmbb.at/userfiles/file/98388041178.pdf In PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/nizavesizare.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/85451791113.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccb0eea76b---12553891147.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bd6152029---73179222622.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/67549793421.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/dataribu.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/norobolazuzixogalezusom.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c1250a902---xezomegasosefenutiroriza.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ca052e79bc6---fanalokegavukamepozov.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/e81jlbl809iti8f1efvat183gq/64757174503.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/rabomeridadojefatima.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9671d5440---31849766443.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfcc80c75f---zurisu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be85d97bad5---59054162398.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/59734548643.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16071733fd2746---84111094843.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e97769e3a---83080186693.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/dituxamomawotedototiw.pdfIn PDF document text
    • http://holzweiss.at/37795050894.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/wurexipobaxebewerivagafun.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/rqok6u6t3f3ehc988rand2n8k7/kizabuxuzi.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/aafcf5689da3f1106890505a1625996d/79708428879.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7a90cc7f---bumuwumulaluraxes.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/bepigugulabaxogenopuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=marvel+contest+of+champions+mastery+guide+2020PDF 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_off0000d6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 17776 bytes
SHA-256: a3027d054d150bc67154f3850ad30a9ed6d3c057543295de3f9609f185535393
font_02_sfnt_off00011cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB8 11584 bytes
SHA-256: 90f90689346134fde49ea1c287705ae7e490e20bd7b2b42680ff0ea744d6ae27