Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab73042f9c3ba40…

MALICIOUS

PDF

76.6 KB Created: 2021-08-28 10:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bbf07762c097366a4aaab2733fd93ce4 SHA-1: c7c9d319e77e9b814ddf6629780c10afde176d82 SHA-256: 2ab73042f9c3ba403a1fdbfa182fa067ada06fb45229302c650747675cea7203
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://queure.ru/uplcv?utm_term=hand+on+chair PDF link annotation
    • http://pro-elec.ru/ckfinder/userfiles/files/49715134153.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/8204452329.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/rukive.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1657c34b8b---fimad.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/ef154dc9cd0c5859237a9c89b3fdc60e/16636739683.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vvi8v0u34f9fsdqq5tu50iv1g7/10839732441.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/93393339405.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b9038d48c---zuvososonuruwirewuguduj.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ba217ce19b1---53342351698.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/xutinefukaxuwetibo.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/sozerifalofenoda.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/4333524948.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae662eb011e---sijol.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/welizure.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/1728224023.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/d362ac37ee1c5506529eb20b57b88b6a/zudobavegukekosolek.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080baee60297---84357123146.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/bufirumikililugunosuze.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/260b5acbd2b5c082c5cba78bb675660c/71134911798.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/17c3049eeba93ea73fef8c7510b53b0c/panefasikejupewitoneda.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/96730897563.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d27b1a9de0---5778443056.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16083375c9bbfe---ginavojafipu.pdfIn PDF document text
    • https://ivanamihic.com//files/62842089792.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c25955c2f---rakarorosudogu.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/31434377896.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160987d1d96d97---lopozo.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/9moobcshk9s6jdgvon7b3b4042/59556559069.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_off0000cba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA6 10012 bytes
SHA-256: 3cf39dcb7b18417e90556de306d0ec91c5d3e4c8b5cf79355d7a4c0e03b42457
font_01_sfnt_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 16352 bytes
SHA-256: d0962d1ea3cdbd217aa01f3cd1c8b6c2a2c6708cc3334fc0fbead33318261579
font_02_sfnt_off00010bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1