Malicious PDF — malware analysis report

Static analysis result for SHA-256 1123376f94d2c1aa…

MALICIOUS

PDF

84.7 KB Created: 2021-07-16 08:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 29c97796aee246d37179f161e4899931 SHA-1: 7c6caba64ad5138dd314194a125be30c81b65311 SHA-256: 1123376f94d2c1aa6c349c90ae32ba161fc6154ec41913d48babd76de3a33ed6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, employing a link farm strategy to redirect users to potentially malicious content hosted on compromised websites. The high number of external URLs, many pointing to compromised CMS uploads and disposable hosting, strongly suggests an intent to distribute malware or conduct phishing. The ML classifier and ClamAV detection further corroborate its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=stock+that+is+repurchased+by+the+issuing+company+is+called PDF link annotation
    • https://tort-art.ru/userfiles/file/nifulijudebogeno.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/labemixetotegoravuk.pdfIn PDF document text
    • http://rideco.hu/upload/file/12413360814.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/94244596782.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/dec316e93576dc5777cee0c0faf363de/kuwiteda.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609993c008898---nudimimedejawixos.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/8868871532.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c39e56869---17884847835.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/83635120385.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/tm71d28fl3nik88pbc85ldbv33/ropemelunaworur.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/woxowigudev.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fade5d9c35---19530598746.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6adc73454a---58224538272.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/22975462101.pdfIn PDF document text
    • http://etre-belle.su/images/file/lazowun.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/nosufemizekerof.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/9069522273.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8e22460cb---poxujidat.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/j3opojf4ehobbttq6pm92fanr7/5652443597.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/85972892369.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/84391350746.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/wiramotiturenugasatij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a944e006a81---29467108727.pdfIn PDF document text
    • 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_off0000e689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 11484 bytes
SHA-256: 53b0111797b9a8f88a6a720ae73ba66679ced6d654bab8a73377354a4229d1e3
font_01_sfnt_off00010117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10117 16888 bytes
SHA-256: aadf2e531e5d1f68bfecd7057a99826a5e785c411a01bdc7d4b8ca2eb814baeb
font_02_sfnt_off00012d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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