Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8fd8c96ab3bc81…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 12:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c06c3f3017eda5ffa8c14df1c9d2bff SHA-1: f673f50a47a273c3f42f76bc82caed3e34cbc10c SHA-256: 9d8fd8c96ab3bc8108d7f6126e7281d27d035eca6340e2b5f1076f29f585660a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, indicating an attempt to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and heuristic firings point towards a common pattern of using compromised sites to host and distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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 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://harchovyk.com/userfiles/file/53721008779.pdf In PDF document text
    • http://studiotecnicodama.it/userfiles/files/xenitekizeti.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/14188753347.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/kuzegikaxoki.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/38700274603.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/kerepiluzowovurekuvimaja.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/gemeluwoxawuju.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202195121023877.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/81825205551.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba5d7e12a---mekufibexopinazuz.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/22941881599.pdfIn PDF document text
    • https://bor-diing.com/upload/files/daxarodemazaneleselegi.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/rufadegikij.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/mepisumi.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/zudizimuzifi.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/2073492683.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161341478915dc---12551808711.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/jamoxojapupimupenu.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/zoforanififobanajis.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/316662130.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/45738534755.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/wumedula.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/pb187rbo58qm8fgtvmgbghafj2/motalevixipubigo.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/topevi.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/rodebifotujinojol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=uninstall+sms+home+appPDF 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_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 10424 bytes
SHA-256: c2f2610726abc067d9ac7cb99ce6c253f7c9b919d902c14b1deb0a03e6885453
font_01_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 17296 bytes
SHA-256: 3c6cb901854bcc59e72636b695dd4ddb945d2407d1669c9d3c2ff3644bf169d6
font_02_sfnt_off00012038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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