Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0e89d7b4123ae3…

MALICIOUS

PDF

88.9 KB Created: 2021-06-29 18:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9749d04e00841d0038d829eb4606bf6c SHA-1: a4c552b73d6169c17d1d38493ee5fd4dcbfe9507 SHA-256: ec0e89d7b4123ae38b7eaf7f0664f0f329e7e07b89f08cff05e089bac95658f2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/drt9ij5hrferborj10tgnsh47r/tapusobalavedi.pdf In PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/911d8fb0fec37cdab7fbbcf8da813960/sotorosuzidalixilelofar.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/a6a6a505b56788082a4ba8b0d9777e0c/66212947977.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/vsrr5pjvht2c6kpaig8e2v58g5/3371542908.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbdea456db---soruwaxilizetevulidon.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/lv7tnidkj1i7odv3icusg6iul7/zapewixabeni.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/vetozabexenar.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b23979b2ad6---naxowutepinigiwagokofa.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/04ece0987cae9d2bef05bfd46e874902/maxijabemufukonebi.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/npuv9gv1gsu170p9fiaomv2q4j/kirasowutax.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-18/20210518200459482731.pdfIn PDF document text
    • http://teifsepahan.com/files/file/72173910859.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609617fbc0df9---6446944977.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/serijopimefavokez.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/b3eafc468598d4e4dec5ea10f0d73011/bejitufugufuno.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6911b42d78---97044578299.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/62759836574.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/patujomina.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/2b62158068e8d7f1561137d544a23c95/sakubuxoregufagojedunati.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/evci69mpe9rjunorkbqrg8c94j/57624434849.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/jinotenemobifepokipun.pdfIn PDF document text
    • http://skncn.com/u/files/31603905189.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/bosiw.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/50500865914.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608bac5eeaf3d---tatumixomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=phc+employee+discountPDF 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_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0F 18388 bytes
SHA-256: 3d072643b9404a64d8d7c12ab7533ebd7781c1e8058a289f91149bbfa08363d9
font_02_sfnt_off00013e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E27 10732 bytes
SHA-256: d2511134f814c8551d8039a95673402c70ede713c74d76befec1f223f91d39a1