Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b9ee845fb49eaf…

MALICIOUS

PDF

85.3 KB Created: 2021-09-17 07:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eebdf607623ff934557f654a49df297a SHA-1: 2915caf32b3500247cc5959de139431c961608b8 SHA-256: 54b9ee845fb49eaf7bd84d4a095b3241cf15b4409067db4fd9d926060a38b38a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains numerous links, many pointing to compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, indicating a lure to download a payload. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download and execution of a second-stage payload via one of the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ulv-fogger.es/d/files/bavobulupowejimazan.pdf In PDF document text
    • http://vonschickenfremont.com/uploads/files/jizupe.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc6d386691---12153610280.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe0a1f6d6---defaxozeza.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/74977670763.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/2319804014.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/vateramugozumofezup.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/25137780503.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/zulebezuteb.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a439e0a37---69080386437.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210904181704.pdfIn PDF document text
    • http://bwc.lt/i/71177625011.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/tugadorozofaregudo.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/5q2bqdt2o4qjaqkp5qkmo2a7n9/33555299262.pdfIn PDF document text
    • https://oriolefashion.com/ckfinder/userfiles/files/nejaluruvoronelob.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/kikutet.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/99593448105.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/zivoradozip.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/kefazewedivapu.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/nuluwovuxe.pdfIn PDF document text
    • http://shopabrang.com/images/files/fakirorusutanoxupex.pdfIn PDF document text
    • http://polkovnik.su/upload/file/34471136155.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/jukebasemunidolikinimob.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/38016992736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mi+a1+android+10+update+downloadPDF 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_off0000e60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 10568 bytes
SHA-256: 2ba7ee7183117b4f9749e354f9b298d6e865a89b5edfb2c63fa1e261c3a87063
font_01_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 18960 bytes
SHA-256: 40c91655834618d47859a75ad5832616affb1c55afc9cc227be8ef8e7f4bdb08
font_02_sfnt_off00012f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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