Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5d4ac48c9ae5a4…

MALICIOUS

PDF

77.6 KB Created: 2021-09-09 13:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b232777deee0e12711611da09c11a895 SHA-1: 7734245926036fe8a0ca6f94b3de396df18d38c1 SHA-256: 7e5d4ac48c9ae5a413edb31413f5364377cbef16b77b1dd80ca1a8fecf56ec10
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to external sites, likely for further exploitation or phishing. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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 http://wildpflanzen-planung.de/file/bobusesemikojuzofabuwo.pdf In PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/v4rbe8idglahll2cmmj8t5eqb0/27306045622.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/79540574216.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/pekezezivasosap.pdfIn PDF document text
    • http://halanmilk.com/upload/files/fonefo.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/jurosuzixuketemitoxidara.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135c48348184---vavutudubatafixoj.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/86146562066.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/77051411492.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/62189819447.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/7314965470.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131c5d36f051---97367202029.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210909053704_a2h6ym.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/wokuju.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/18068351675.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090516461473499.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/90138119791.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/42027267895.pdfIn PDF document text
    • http://ccadl.com/files/20210904160419.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/50986167611.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/xofavi.pdfIn PDF document text
    • https://norservis.cz/files/files/tilegudevezagovuwegisev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+expanse+project+free+tvPDF 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_off0000cb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 16912 bytes
SHA-256: 243f5a6e543bb4f0b2c02653d1bbf6bf3c22228f83d96a547240e77362b6ef7f
font_02_sfnt_off00010f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5C 10700 bytes
SHA-256: 4ff157e8523318e466f8f8ecf9ea3fbf06c5fa76cf7c5137f44f8f7203c0fe84