Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a9a95e4ad5b51a…

MALICIOUS

PDF

84.5 KB Created: 2021-08-12 02:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ab08e6b4dbe780ddd975662c6af93b8 SHA-1: 37613ef3525cb9e67345e5aba430111d935c0240 SHA-256: d0a9a95e4ad5b51af8d5e6febdf8c3fbcf5502362aa311004dd58812c60d91c5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cafegreenwichvillage.com/uploads/files/75356997766.pdf In PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3abc2941b8---mawaravafifuvekigum.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c1658aac1---85329627323.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ka0utlffria9noho7qs8v3sqa6/79463438536.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/7892fa17367a760804ce60fa2df604ba/solaleviniwabobabosami.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/2jnm82mvrlgv6bpqdublfc8br4/97408186552.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/5a816a1c0097deecda97edb1c97a53fe/41762307285.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/94a8ee6a2b2147fdc7adc896036efe59/lefafelenidozuxit.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/9cf6ea09a41602cc78c49ead067a7528/jezigod.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/36660963988.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/rozafiligux.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/feratideb.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba727faeb98---bewopi.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/23b06d5773f7fff7d956b7f38111a5e3/vegawibepifarefilere.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/fb0a0c7b09ad9cf0afc66806a348eaed/49599638002.pdfIn PDF document text
    • https://raljob.com/userfiles/file/bedegatebunuva.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/51bd75bd93fe3feb2ae21f671ce96ad5/kebirovoxujufulofor.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/gufavipomuvevonenafap.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608252a17ad35---gesexor.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aface3aabc7---tufaveregevomixubuwome.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ue0gcplbbovk1970voen924e88/liwoludu.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/wuzenunesozuzun.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/xunefelajebebidawufezoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=argumento+del+cuento+el+solitario+de+horacio+quirogaPDF 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_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 16960 bytes
SHA-256: 241468f95c401153cc214a75bed4a1337e7953f5b4ee0a52546825adc3996b06
font_01_sfnt_off000110fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FA 11044 bytes
SHA-256: 5c5168b27f3d1947e0b542a1403744ce09bbeb5e7f1c91cced044b4493aac4c2
font_02_sfnt_off000129fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1