Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca5d47739f1f419…

MALICIOUS

PDF

74.2 KB Created: 2021-09-16 01:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2cac2d491dbf19286556d180eeed51e8 SHA-1: c428979eaa823331acf014ae195f154ce8924894 SHA-256: 4ca5d47739f1f419477797e5f6cad394cc2d324fa806f16c48ffba310ccc5347
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm patterns, indicating an attempt to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common tactic of using documents as a lure to external malicious content.

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 https://ketchas.ru/uplcv?utm_term=agent+vinod+full+movie+online+720p PDF link annotation
    • http://avanti.pl/userfiles/file/dapurod.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/06be99f3bb7dfc041e9cac3293fc1673/tovavanegu.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/45087017818.pdfIn PDF document text
    • http://hanauhrova.cz/files/memofoxutajosi.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131c1fa682fe---12401207123.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/86397307355.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142606d601c0---kimesepixaginavat.pdfIn PDF document text
    • http://195exim.com/datas/files/14339236560.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/31851079466.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba8a3ba98---bozixufumi.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/zonowori.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/12833623003.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/20943258755.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/gerisagegulaki.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/69592831379.pdfIn PDF document text
    • http://vit-physio.de/file/zifux.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161358162edee9---68488089348.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/xanekevomemib.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/32180621461.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210901115828551279.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613799024a132---13847081317.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/66177302137.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/50484101281.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/82477847735.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/85435365452.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_off0000c008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC008 16360 bytes
SHA-256: 77a7a32539a9abfc05b5e1fbdc66218f96d0544f0376d3138077944fe9b1257f
font_01_sfnt_off0000e9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 10848 bytes
SHA-256: 9ac6ae6e4e260efde78f0f1300010c5131c38e6f26fff6133599d94db6e6747b

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