Malicious PDF — malware analysis report

Static analysis result for SHA-256 e869a0dd5dbcea61…

MALICIOUS

PDF

88.9 KB Created: 2021-08-20 07:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 689ec8f771585f4ec564b9bf7f09e46f SHA-1: 31ed75ab45aef19a2def289773db3d89576f5a7f SHA-256: e869a0dd5dbcea61b46a085c758babb9698ec4262d50e8380627793523d6fa5f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. The file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection further supports its malicious nature, identifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://gorisum.net/fckeditor/upload_file/file/98953277511.pdf In PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/14351071652.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f61d114cc7d---nofobadexapegupozab.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/litufewixatovamazag.pdfIn PDF document text
    • https://tl-systems.hu/files/files/gixetakubotarupugefudusi.pdfIn PDF document text
    • http://elitvorota.ru/f/file/gizasipegudizokebi.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/98e05689c45347e14d654bb97b570aec/63067098539.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/21902577372.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/fc1b0d678f9552b72f91e678c8203b04/12640465120.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210808044452_jewy4u.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/cnscah5208ig1fvvqvb6qpr8f4/ruluminirusitiv.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/85681019977.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/winiwoxefe.pdfIn PDF document text
    • http://capri.lt/userfiles/files/62562482697.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/39214937916.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/18674147499.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd2354f9fe---81049430855.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/mulepogizitejote.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/66013473823.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/333ca770ebfca63a3434dd001d45ba57/87738531474.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f5e5cdbd968a6d865d217f246b102458/voxevow.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/86563209800.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8e6e5ed17---wutilume.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/b25shn3ngvpcgdddl8kgmvnbf3/72867610861.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a28190876c2---zegefigabagirarowigi.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/0lmb725dm0lncl3tti764ppg05/37921673275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=construction+planning+equipment+and+methods+9th+edition+answer+keyPDF 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_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 11700 bytes
SHA-256: 4ba00fb6783711f5c4a0d846efe27e38631a9a4887255336bbb7e0399f99eab8
font_01_sfnt_off00011051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11051 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12863 17244 bytes
SHA-256: 6ec7581f3882094e0aa3cd120d31bb092a5017558cf8644247cbc1f79349090b

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