Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac6b3b906f07f9e…

MALICIOUS

PDF

86.3 KB Created: 2021-09-17 10:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 80e6471c6d69d6d66135f6ada2740521 SHA-1: a84a6ca3269b64f6bac1d635e341e9f8bb02bd43 SHA-256: 1ac6b3b906f07f9e4236c27af196f063a51eac6a9f7e431d6481a649d4ff2850
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for malicious SEO or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://skl.deindrukdemo.nl/upload/files/88258692698.pdf In PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/lowiwit.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/vipokolebu.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/18060735736.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/gelogiripopejuwerasuneri.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/17526577756.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/fafedapusonu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/u65e349rjtuaglgfcoang36oau/joresivibetazezana.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/bimix.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/womilimafunovafexa.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/19763258572.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/55537752296.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/fitiloxinukel.pdfIn PDF document text
    • http://www.siposferenc.hu/html/zupigimibu.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/kugipa.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/31424425436.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/56427346925.pdfIn PDF document text
    • http://etnorom.hu/pictures/tijetuluxojugegepoz.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba31a3aaf0---legeniravuravawa.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/fitusetuwun.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/xojuxoru.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/zewasevefud.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/73470311527b00dc1b48d8508ba548af/buwebizivula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=command+and+conquer+android+gamesPDF 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_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 17340 bytes
SHA-256: 8eb7844140acf6e56a97ef1cc50fee83dde8fe53139eea528e965cdfece9bc21
font_01_sfnt_off00011b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13344 10848 bytes
SHA-256: 3ed8c31648ff9893eac6c9ee026ef7b1306d3283d6389f89b1f7ae4d8709499e

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