Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c54593479f8f2c…

MALICIOUS

PDF

120.1 KB Created: 2021-06-27 20:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82c98dad6d59d5778297be6d9cb3df11 SHA-1: b15af499552ce16b5268c01ca83eaaf5683a17c3 SHA-256: 70c54593479f8f2c5f5f39bb17985a21ef2e9bd2135d29c8c1bb8a7015c642f6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicates this PDF is malicious. It contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute or obscure malicious content. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://goodslib.com/userfiles/files/27754654685.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/30944777019.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ib5vhmv6mctrf4l5gt48l4q033/69928337913.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092e0fef12ca---jujomi.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/gem92ph5lh0dan6tsc3uud9r35/42272774771.pdf
    • http://agataklimowska.pl/userfiles/file/geguzuginukibuwad.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfb7247ac1---kimemiwefumababe.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160823c83b8a95---varurizexug.pdf
    • https://ukmalayalamnews.com/userfiles/file/20012831702.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ebcb6e8e---32449549767.pdf
    • http://emrc.ie/upload/imagecontent/file/23065696338.pdf
    • http://aarogyamedico.com/userfiles/file/8989561716.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/p0679qvg54rso9a67tc08acth1/14556586761.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/5611b58e3224710fadac97e71c1fed34/59656325813.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ej005ma753prmtb5l7asf0osvb/sinek.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/6nvig2pe4bomjf3vtvp560k7t5/wuwijev.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074366be140b.pdf
    • http://notariocprietoa.com/notaria/documentos/files/nurababededufu.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/25ro7dgksttrrrf19baic42vlb/tuvobetu.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/0f10f445ea820418daab0fb2e09cf948/wuvenobinafuzevi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2fa54d80a---boridesukizorivokajovu.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/bafc950af4234d2901257078c1377e1b/xavepodudunisi.pdf
    • http://mid-europe-ex.com/images/blog//file/sujufixulapu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=incoterms+2020+ppt
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ea1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15EA1 16792 bytes
font_01_sfnt_off000176b8.bin
1dceece514122c2066cb5d5dc79fc3139f33175b73e34dc8d042f3161b67c2ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x176B8 10428 bytes
font_02_sfnt_off00018e63.bin
911d2c22cdf516d4f07613825845f435b8694deb782bbeaf450f3cd5c84fdfb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x18E63 37240 bytes