Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20bb6b4ebd9fddc…

MALICIOUS

PDF

97.8 KB Created: 2021-09-17 11:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a36a26266a0c1b08ef7dd437a99e9285 SHA-1: 53797d5bbfc06a47beb822407fc42d919634628a SHA-256: c20bb6b4ebd9fddccf9c06018354d63e4d9d6991f669a5f426ffa9281c0b9188
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites or phishing pages. The presence of external URI heuristics and link farm indicators strongly suggests a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=babylon+the+great+has+fallen+god%27s+kingdom+rules+pdf PDF link annotation
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/97923467834.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/68457862344.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/jegepebugujabawenajur.pdfIn PDF document text
    • http://cssh.es/img/file/mirotobopukokali.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/pazulatosi.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161391af7b4d2f---jonolapitefisofapovoto.pdfIn PDF document text
    • http://ciskmv.com/css/file/lemetepovove.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/7ekvk4p26dfkmnko0cg1u8j5r2/55873077929.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/61716ce2d2dab14619d9a9157c91e354/77683339640.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/supese.pdfIn PDF document text
    • https://okazionche.com/files/17157840641.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/wivotusap.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/kiditijafakorutaz.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/96594445475.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/dc91c98ce03bd98c8447805929dc5f44/6874812950.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/19576172626.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/jerafegumidisorulozejoj.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/kenob.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/wibikibajibizasoje.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/fogurarugiwuxoronu.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/dirosuziguvepimo.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/65006008987.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/fopenurene.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_off00011686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11686 11476 bytes
SHA-256: baf95ecae594c4a4e7d0119d938cc3bb31a9dfdaa0c7e08ddac7fbc54d2f9d97
font_01_sfnt_off0001312a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001493c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493C 18352 bytes
SHA-256: 23bd0ded1884ddffd2b50feea8625e9ed8ef82c0adafc62dc9d3f5dd52afdac6