Malicious PDF — malware analysis report

Static analysis result for SHA-256 21e1d46fd124e115…

MALICIOUS

PDF

89.0 KB Created: 2021-09-23 04:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 32eca11218a911d92e1e20141ed93594 SHA-1: 0c8365bd9de7ab6a385e36db816f73deae8c21d8 SHA-256: 21e1d46fd124e115bee7ffcff0a08c29e510fe1858f62540ba87b24d12ffaafb
204 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains a visual download button lure and a callback phishing pretext, suggesting it aims to trick users into downloading further malicious content. Multiple URLs point to compromised WordPress sites and raw IP addresses, indicating a link farm designed to host and distribute the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/dm9bpvp8otsqinn9vmrkuk5vl4/91292091235.pdf In PDF document text
    • https://shidoremicrosys.com/media/kapavewimemopebudi.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/59872314435.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/sivudagotapifexuzatak.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/ralezowona.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/jiwuwewejevileminixobenu.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396cdb9529e---vafonil.pdfPDF link annotation
    • https://hchoanglong.vn/userfiles/file/ruzoviliroxovoxopalo.pdfIn PDF document text
    • http://dentherapia.hu/files/file/rebidinam.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/bisatozolunedovawiwap.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/xefuxalaxum.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338451979eb---beruf.pdfIn PDF document text
    • http://chinahongji.com/d/files/sirodogopogopojubazu.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109212131195910.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161458fec72f9f---zebiropine.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/89224129157.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/napidumizutulosojov.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/10187460094.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/33470610950.pdfIn PDF document text
    • https://buka.ru/sadm_files/17674556609.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/bokazasawepeleme.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/88560763740.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/nerujiwisaga.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/26588291669.pdfIn PDF document text
    • https://dm288.rs/slicice/file/42665439602.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109180637374114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=make+launcher+default+androidPDF 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_off0000f5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF9 18488 bytes
SHA-256: fe6c10c5fbab67a5f25dccaa4eb40ac6fdca7eefd56575dbb7068689f64416a6
font_02_sfnt_off00013de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE6 10588 bytes
SHA-256: b13c42ca2dafb512f715604bdb7aea4d39e357ee992d04d8330f3aadb7b6a26c