Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf4cecabe67d647…

MALICIOUS

PDF

83.8 KB Created: 2021-09-11 21:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 931ba38564dd62743ce31d5f6aab53a9 SHA-1: 5c6a26faa22e118a6568b33edd525cf745272cd9 SHA-256: cdf4cecabe67d6472b035e9e1e52c609acbad67a1390fbbbe4bc86c97e660312
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=yaseen+in+english+pdf PDF link annotation
    • http://solarissoft.com/img/userfiles/files/92521067993.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/28699835478.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/xekek.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/nuxikakusufegawuxenuve.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161309df96d02c---momiguzomewoxijav.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/bowagokub.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/42521739532.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/55875825576.pdfIn PDF document text
    • http://khocabien.com/uploads/files/dizefazubolimigeta.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/wugedol.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b91dac87b3---xaxamidazu.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/74931376179.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/70838260778.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161366dff6d2b5---waderadalate.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/97113298649.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/73843409900.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/54569235814.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/87139667484.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630692745_2e594b3d04.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/19204097072.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135f6dd2f3c7---teguligezexujotox.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/97597292756.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/60492151047.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_off0000df05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF05 20144 bytes
SHA-256: ec67a5a05423b0bd4cee4ae9a99cc1bc478c1c9d8ab5776972ba2855a631f67a
font_01_sfnt_off000112b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B4 10444 bytes
SHA-256: 297840092389102e27c12aa3c049c6275772f27a75790faf580aa1c20fa3e138
font_02_sfnt_off00012a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1