Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e6852fda918742…

MALICIOUS

PDF

87.4 KB Created: 2021-08-12 06:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 34687c7b9e0e5477b31f5ba41c02a7a7 SHA-1: 0ab7c4a0ff1f9383531201fc6e989778c91eee2a SHA-256: 16e6852fda918742d0b519e7c6523177764ac97c147abc5e18cfc4387081bf0c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to a variety of websites, many of which are hosted on compromised WordPress installations or utilize disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve as a landing page for further exploitation. The presence of link farms on potentially untrustworthy hosting suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://catamma.ru/uplcv?utm_term=cuando+se+deben+sacar+las+muelas+del+juicio PDF link annotation
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a7ceff493951fa4d1e06c2db6219075a/7347102544.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/60333288660.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/tilekunopilodubese.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/30c692d86ea56df5f819ffbee3b3ad70/99377550710.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/feb461aefb00174c6293d45aa028f9f7/tuzijarugonoloko.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f6eec0490---17943523374.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7f4156b21---desivawerekavejo.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a747c0edf8a439963138688fbb43aae8/17575079524.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/83187150704.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/jogufe.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eda666af6---58503040548.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/11613364594.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/93631778043.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/48769483028.pdfIn PDF document text
    • http://lachina.cn/upload/file/zuzaxe.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/ligawi.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/fagewo.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/69038967318.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/22431497914.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/43edd932660895490477b4726c6ce4f6/gamamiwuza.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/tuvedawuxazax.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/16231377975.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/6e8fh0fu2p2js02535qrhpgcf2/tutet.pdfIn PDF document text
    • 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_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 10832 bytes
SHA-256: f26385583bfaf151be1d2826a70bfeda21d4ae602f4032177c0258ee93f1569c
font_01_sfnt_off00010649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5B 18212 bytes
SHA-256: b43b4c62a2dd834141168b819ae3ebde887238d3079d13465a8a66919cfa8c22