Malicious PDF — malware analysis report

Static analysis result for SHA-256 500d69da41da04c4…

MALICIOUS

PDF

72.4 KB Created: 2021-07-07 13:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45d23fedb93f399ac88b46fafe2b9d9d SHA-1: 5f099cffb1de4bdf823e8a550155f5158755e22b SHA-256: 500d69da41da04c4e4fd125c5eff47d1042f04717705cf9b3f8df9d7419b6e03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://baoholaodong24.com/userfiles/file/73151358833.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad16727fbb---dupigasa.pdf
    • https://xlspandoek.nl/userfiles/file/36752791174.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/85e814dc27a12ee996201c635067b399/50186093606.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082b3d5c68f0---joxawufunuvovuvu.pdf
    • http://khacdautron.com/Images_upload/files/65109898118.pdf
    • https://airflow-skateboards.com/upload/file/pileragigovipofexokat.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d863f3313a205fe18a293558b8b1729d/bujovagabezogewut.pdf
    • http://shadesvalleymounties1969.com/clients/868959/File/rojijafex.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736e639aac3---kekof.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/8eb5b46a33dd51adc274e4d0dfac46e1/xudetigu.pdf
    • http://mea-travel.pl/userfiles/file/wazelago.pdf
    • http://dijladentalcenter-qa.com/userfiles/file/sezazevaz.pdf
    • http://hoteldanang.vn/uploads/images/files/gozuxabudizijazineru.pdf
    • http://talleresjpg.es/img/file/faxiduravexaxezedima.pdf
    • http://batiment-tunisie.com/userfiles/file/sadegobid.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/117074075160cf4f8f6cab1.pdf
    • https://soft-print.pl/app/webroot/media/files/satusa.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075a518da41a---38230352714.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fdde61677---nuluruse.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ffd0a154a---45114034997.pdf
    • http://electrogalicia.com/electrogalicia/recursos/archivos/66538668401.pdf
    • https://toolsatool.com/userfiles/files/57841363356.pdf
    • http://senseoftourism.dk/userfiles/file/14885841572.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=12+angry+men+study+guide+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E3 16792 bytes
font_01_sfnt_off0000d1fa.bin
3d010a5df5eddc945b8aa87b6067b032a8715ad8a4551c8b7ec2e1f98fa968eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FA 10800 bytes
font_02_sfnt_off0000eacc.bin
e5d72719609885c20b3a08506b1e440cc1df1473f6a2c1da260ad8622d273fae
pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 15936 bytes