Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c5b147cbda291e…

MALICIOUS

PDF

86.8 KB Created: 2021-09-19 19:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a13da5e271ed3f24f549a796705b8e4 SHA-1: fe07edc5f460cbc99229e34eab9279dd7633a838 SHA-256: 49c5b147cbda291ed25cd4f7992691e80f29ff8a4cf2ec4ce159d5f0e88cff1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating it is a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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 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://kawoka.com/userfiles/file/temunalojuniwubovewo.pdf In PDF document text
    • http://wadsoda.com/UserFiles/File/waxumarukodugevogikisa.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/23765656925.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/suxipimugifovivatu.pdfIn PDF document text
    • https://aashianarealty.com/file/vomudexik.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/wanajupimerovibifaxa.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/37267479839.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/sepaxevi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/js70o0buds7htiqr5k3jga83ig/mimojulimab.pdfIn PDF document text
    • https://energooptima.hu/upload/File/67005741145.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3f7be4b935f741208b498fed5a72dc5c/fonowep.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/90941731925.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/bituwopibikofa.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210902_A2D91E020D833E54.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/lejasulob.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/niritinirujelali.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/zixumafeje.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/mululinazex.pdfIn PDF document text
    • https://istanajp2.com/contents/files/45869370014.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/4643843333.pdfIn PDF document text
    • https://maria-galland.ru/files/file/butavutevi.pdfIn PDF document text
    • http://ruresept.ru/files/file/68130609012.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbf9b1210f---bibigetagifomiwifig.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/92648199591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=best+dungeon+games+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_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 10696 bytes
SHA-256: 6631e4458e197c518766c73f8bddf882984740ab6953ae9a7582da6dafabe11c
font_02_sfnt_off000122f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F5 16400 bytes
SHA-256: a348f46b7e0b873cf254365318487de131a898c7a911626cd49e097d4ab4a438

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