Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc9b3396eca669c…

MALICIOUS

PDF

98.5 KB Created: 2021-09-08 05:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: feb10d0bbab8eeacc191ca2c6415e9ac SHA-1: 9ae78ec44199ad38e7e9bb4aa821171c79c5148f SHA-256: 7cc9b3396eca669c6c0ac52190f073c0586e0661faf76bd7007f71781bc6b357
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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 http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609473537346e---xituwutise.pdf In PDF document text
    • http://chongthamnguoc.vn/img/files/latamurorarosukexidozofav.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/dininonogotavikinolofuz.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/13027429631.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/sidinakarezomaviwawariso.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137f0fd61fc8---47828697178.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090700321655.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/35617359188.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/26404868208.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad107fdeb7f---vunamuzigerubupegumogipo.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b19156ab4---56876833015.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/04e8b042ba16221e84f895d8c3a4d640/77105333870.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/55982107886.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/dixakes.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/82818423492.pdfIn PDF document text
    • https://www.micron21.com/application/third_party/ckfinder/userfiles/files/rebusupar.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/74745580238.pdfIn PDF document text
    • http://hasyo.net/files/file/nefokaruza.pdfIn PDF document text
    • https://tessuno.com/upload/files/60e92fbaa7eda.pdfIn PDF document text
    • http://servmed.net/userfiles/file/99012255007.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb62878ed4---15849024309.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6dd2b32073900e7f5f38065257bf4b4d/tetaxe.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/dakapasija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=parzival+pdf+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A7 10684 bytes
SHA-256: f925877eca7f27e94ac415c872dcc71d18b0cd37ffe686f85569a321f70e088a
font_02_sfnt_off000130d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D7 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_03_sfnt_off000146c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C1 20436 bytes
SHA-256: fb948207667be7d6318c6d9258736e3aebb8998616b36e2e4ad62fb3bd97384a

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