Malicious PDF — malware analysis report

Static analysis result for SHA-256 5299b95d9aaf32e7…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 10:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df2a567a7f1b1e99960fcce06f79d89d SHA-1: 55a7d1a1a0b11164bd165c51687c0522317c1d6d SHA-256: 5299b95d9aaf32e7375a963a4a62724203cd7bb18ea9587fc605e401e10aa9e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised WordPress sites or disposable hosting. The primary attack pattern involves luring users to these external sites, which could host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130ee6c99550---29044111168.pdf In PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/datunulo.pdfIn PDF document text
    • http://geodez.com/pliki/file/niriwowajufigel.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/75776762503.pdfIn PDF document text
    • https://semut73.com/contents/files/zokiz.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/ramepusu.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/52678701664.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf3f2e0fd7---xonagiri.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/semasejavuvuzexudemi.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/52704021918.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/zuvisu.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/lalefetinekosake.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/94045039504.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/35664855279.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210909_443BBBE51387508A.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/sutudiwor.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/wufokobomibimofabak.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/75219835379.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/32946921315.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/85182819173.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/zuxewumuzimubanekuvu.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/7320428569.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/goxepi.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab24bcfe2a---74308011714.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/dazosa.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/4383425142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=john+michael+greer+pdfPDF 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_off0000e624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE624 10792 bytes
SHA-256: fe04209bd0a6f58bc8f4bb37ee3b44b3884f2b76acccda3db6e8de567d0234a6
font_01_sfnt_off0000fe82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE82 18752 bytes
SHA-256: e0f101936f1060149fa5a903242a7adef7cc35a084c2125f6a34753189f776ea
font_02_sfnt_off00012f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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