Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f77ba02fbd6d012…

MALICIOUS

PDF

79.6 KB Created: 2021-08-17 04:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5077560c66bbbfc297dc6d7d906f993e SHA-1: 0be8a931c676d0d6d16cd64ef3d1e371bd2e12e1 SHA-256: 7f77ba02fbd6d0129ad45037014d06618561005d9137d4161b78239e44f319c5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites that host further PDF files. The primary purpose appears to be directing users to these external resources, likely as part of a phishing campaign or to serve as a dropper for additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d07fa9273f---23814450793.pdf In PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe41a7122d---gulazaperu.pdfIn PDF document text
    • https://anup.bo/images/files/98173457568.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/65239290563.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/21953023017.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/fixikaniwuzobor.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609434fc2935d---40461099106.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b8647d4acda---53310308966.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/11411893694.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/topudezidu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903696a3fb6---vagibasisogavefeji.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080771820918---mejolaveku.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608472f9ef94f---18732880246.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/j61ptsb14t1rqth7s9val2721k/zupexedejiponoxid.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/26290796305.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948f32ce209---48200744727.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/taxawiberopujawunibod.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/1802ea8ad54109cbdecc225fe1dfa280/87904236864.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd43ed2002---zalul.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/kijigulegikowiruxaxugaki.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/61993035845.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lm5rrpu2thetm5703la34d568v/44292748005.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/viduvakujetitotenosizi.pdfIn PDF document text
    • http://deltools.com/userfiles/file/77769585416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=who+owns+the+ice+house+ch+1+summaryPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/9275de6a6192f4faee2422e895469eb1/65255742957.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_off0000d4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A2 16328 bytes
SHA-256: 311a66bf3d861d541fa7f3a4a61b7ebe6fb17244c76e3c7ef187a0e307372105
font_01_sfnt_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FC 10796 bytes
SHA-256: 331a54422fc9934129a64335722caa3cd3025b6fa10d8b433b499c93a8fd1193