Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6c7605d409e5d7…

MALICIOUS

PDF

71.2 KB Created: 2021-09-06 09:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a906a599b9f6be3a15bf33ac48746a1 SHA-1: a7b9e287d905d3f9b85e6264588c65854368dba9 SHA-256: ed6c7605d409e5d778b34427bab317bb80b2e8f2d90696bc924d3269a4eb4188
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs, many pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to obscure the final destination. The primary attack pattern involves redirecting users through these links, likely to phishing pages or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=nagaland+state+lottery+result+today+4pm+pdf PDF link annotation
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/i1vm1h28hfipbbifsoufc28klm/ximusupewamudodawe.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/i29s2b1sla6r46j5hdh7rk7u2c/jalimot.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/vomeni.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/60808936086.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/180448358031.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/10491108542.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0c129191---95410832831.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/94440640404.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b70616dd49---23457708960.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/2ddff3b09efdc18cf717b34e55e15f18/tonabobu.pdfIn PDF document text
    • http://labradory.pl/file/mufakegojasemikiwagu.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2f806943f---81827388521.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d32166b137e1e167cf6e92319a38534d/jukesukeraradinemonos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17eaa6b023---mokoza.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/fololubag.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/55823857797.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/wonofejogatafaja.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/280351134344.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/zewer.pdfIn PDF document text
    • http://ledins.lv/cms/file/1651218543.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/77959257678.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bcab8b016---mekafiruzizuxutito.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/73619637882.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_off0000b6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D0 11016 bytes
SHA-256: 016f6ed108970298d14f1732a30bb8a198c7ee4b58c6d653d7b25a60678b92b7
font_01_sfnt_off0000d052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 15180 bytes
SHA-256: 661d0ee92dda79713cb1a855dfcf6f3befa0cafd41bcc510c4475f9389118bc4

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