Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b662ec4cb1d0dd3…

MALICIOUS

PDF

83.2 KB Created: 2021-08-20 19:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9584a20221e3a4056e0eb5d3bddcbefb SHA-1: 2bac8511422ecf9d0abde3ac93fad333f06b4dc8 SHA-256: 1b662ec4cb1d0dd3ce34fad93fff8830ce31e9c48a4b92dc1134fc5744e0784d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable hosting. This structure is characteristic of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9669

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://nulifeus.com/~nulife/userfiles/file/fopomuwetawogelitemani.pdf In PDF document text
    • http://lavalnerina.it/userfiles/file/jalalumenok.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5eb3897c46---vawobozu.pdfIn PDF document text
    • https://soechi.id/userfiles/file/56459472801.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/wijemizavorizefi.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c68828c0e1b---tinokuwuzixagozeb.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/7811594239.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160741f9f3bab7---noxudoxomumutiriraridosuk.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/kutogiviwoxuzedowizibiwu.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/zowifabigerelojawaferake.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/92a12a88b0c2054469075ea5b22cf72f/butigugopaxisiropojiri.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/fenegajababijisesegasezo.pdfIn PDF document text
    • https://bdata.vn/upload/files/rumipiwujixoredali.pdfIn PDF document text
    • http://remobudostol.pl/pliki/fovesodowofu.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/46966027172.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38edca4e96---54533004553.pdfIn PDF document text
    • http://townsendrogersfamilyreunion.com/clients/9/91/912616e09393d205379ff76530a10a1f/File/piwepesobawinapovitero.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/66959350001.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/53688242701.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb51cd094a---xoviwevafu.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d71be06e0---99792104451.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/77baa8ed4275777a2db70af4f4e8975e/zesigoperidofebaxununer.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/52704306492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=personajes+de+la+era+de+hielo+3+y+sus+nombresPDF link annotation
    • 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_off0000e88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 18728 bytes
SHA-256: d36e37bf5f9b1486820faa53cb05f5410dcfbfc16f93d7504186e24395a9af3e
font_01_sfnt_off00011757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6E 11072 bytes
SHA-256: 1fae459c0aafeb721dbf9611fe8a6bb054c26b6ce5e3164ccbf18b2078618ffd