Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d711e81c2a023d4…

MALICIOUS

PDF

85.7 KB Created: 2021-07-24 00:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4943f4c039d966232e711417f19c8a6 SHA-1: 514a5316b1016a95927676a43d0a23cd3961a225 SHA-256: 8d711e81c2a023d4ceb7daf0d98617ece8d3251580fe20b0690b089bc8526787
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple external URIs and link farm heuristics indicates a strong intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/478fd5aa1e81396614a36d67b8917ee0/susimuse.pdf In PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb86a94d07f---55340750936.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/52321bf9ea9ed554dda440accf378a0d/xezul.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/gosog.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/70468925327.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/rjn8oee2cq37442r8e3bdet1mm/paneganaduv.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/b5s4r73rj641e11fjs3v8buhp2/56086438301.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/70714939703.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09c0311b3---wejuxizofimawumuvedodo.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/vunuxinewot.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/134feh82urt4gf8jqsbblkhck8/1859925692.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/11841796554.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/gonemomeluzaboxinuredeve.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d44668c493---mudaxipusefolukuma.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/72b1977ac5c6e621a00b8c2ccedb6c40/rokosun.pdfIn PDF document text
    • http://rayer.cn/d/files/40617322080.pdfIn PDF document text
    • http://berbun.com/user_img/file/14121089602.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b729c0c4a5b---4698919871.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/80881028301.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc3f5f00fd---zesirem.pdfIn PDF document text
    • https://ka-base.no/images_content/file/gogowobugedivatugaj.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7752ed6813---xavunikibivi.pdfIn PDF document text
    • http://shesob.com/file/files/lilofofutalefuxetal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=amc+8+geometry+problems+pdfPDF 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_off0000eb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 11048 bytes
SHA-256: ac0e5b0d54d7a3056927b52ec47d7eb18f73b872e74615ada40bcbbf2e97cbb7
font_01_sfnt_off0001047f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047F 17244 bytes
SHA-256: e952fed390f2aeffe8930fd1b6f70f35f88aed6661f15a388b3a1bf756c4eaf6
font_02_sfnt_off00013165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1