Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91a9f6bfd22fdab…

MALICIOUS

PDF

101.0 KB Created: 2021-09-05 05:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6ec9934dd8f83af58a98c046185bd00e SHA-1: 585ebf447ad861d0694b6d69dc96aac1d897dba6 SHA-256: a91a9f6bfd22fdab08401659d080626b8c395729ff413a20c9708f3ffc8b898a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which appear to be part of a link farm designed to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest the document is intended to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=dungeon+world+character+sheet+pdf PDF link annotation
    • http://buffagiuseppeinfissi.com/userfiles/files/ranaka.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/51546967200.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/23388252132.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/29797020992.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/tofufatemamoxubofamajoz.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/duvimazojiwef.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ba2cc6d13a0c959fb3e2b1342bf14c51/laserodarawifuw.pdfIn PDF document text
    • http://inglewood1968.com/clients/68690/File/33279941475.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/varisilesipesefo.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/1fc8aaaf3a39ba6f989daa4395bdaf81/vutilodijuruzijo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160729edfdfe9b---kimawadel.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106151558048046.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/8883039290.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccad1e8373---melonorulag.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/73e5d3cebd751191989d72eddfdecf18/90101699136.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769acfc077d---jakesobavurizuni.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rlgra7s9a668v2foegqf31vm06/judosesibezak.pdfIn PDF document text
    • http://opersan.com/file/37680928756.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf699b9296---valinovanokenabenanoge.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/36273963355.pdfIn PDF document text
    • https://curryleafharleysvillepa.com/hang/userfiles/files/92976081167.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/6495343794.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_off000121c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000139d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D6 19532 bytes
SHA-256: 3af1bea044535af7036b1b178c563c95f8cd7ce8b719351d68d72cf099056429
font_02_sfnt_off00016ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CE0 10992 bytes
SHA-256: 63d520bb066003aeb7eefc9dddfc9f04f6d8c5b107a5b4e53f16916bec052b50

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