Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1b3209ece40fcb…

MALICIOUS

PDF

77.6 KB Created: 2021-09-07 11:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d88bd44c4b4b567a327731a9ebb2304e SHA-1: ae35cf9d5631578c1869cef1f03fa3b96c5a3550 SHA-256: aa1b3209ece40fcb3ff0a43df4e5211508d9b086abd807b2758ffcf8ab766801
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The primary attack pattern involves luring users to click on these links, potentially leading to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ghettaetamionarchitetti.it/userfiles/files/50156507953.pdf In PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/66955844568.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210430020852101.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160865876da997---vejikeradosufaji.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/29121082983.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/4400998881.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/9136f762b4ec4443f6dacd6ec80ec347/noligixitunafavidavu.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/45388844820.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1c630075f---95511478080.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/1nta6spbkoofqlho5c1np8bdv8/68242493996.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6343d5c0b7---vekokup.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/limupinodaxudojafadasa.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/rufek.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/80973182223.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/45716001208.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/98707479617.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/a77ncs58df9p3tuv73n5vaf791/nutofidutezarimoxawiwapi.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/jirinut.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210811200714_f2u29h.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d370e2c13b---6293618290.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/lazavomexedotakogixow.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/d5ftp1mkjfnqrsbnned9nith9o/43055234971.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/78143385718.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/30693215315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=dialogue+worksheets+for+grade+3PDF 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_off0000c95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE175 10980 bytes
SHA-256: 60e84eb5c0e3f46e270ed59dd71ee2f1c545336767a3df22113ef0d630890f08
font_02_sfnt_off0000fb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 17512 bytes
SHA-256: 7868a8b71a74354dc75e60274172b178c76f5192cf8ae088ddf2cbd63cccb399