Malicious PDF — malware analysis report

Static analysis result for SHA-256 8710f061f1e9f818…

MALICIOUS

PDF

88.8 KB Created: 2021-09-02 08:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 12c2c8fef9004b60695cce4e30f89976 SHA-1: 94be2a35a7c8c3fbdb43b190c3cf87d7c23d72b4 SHA-256: 8710f061f1e9f81885e88b256a6605c7ff3f233d2fa8c3a31b1a8cd090535ccf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an MFA/2FA-themed lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://pistant.ru/uplcv?utm_term=totok+messenger+hd+video+call+and+voice+chat+for+free PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a78c188397---wakuwajapomekemifunewe.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad835354d4a---zuruxojididofefibi.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/5278789089.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3a8119b15---goxitenifogobimeroko.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae50c780c61---gofefedonumesusumusugor.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/pavegijowimipugo.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d27ca33e0c---92036268430.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/nulasu.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/domuzejofeziwomebejitizuw.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ns1dca3gtcadesuutdnhc5n1j0/koxur.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/9a1a2b772576e9bfd036ed519328c226/jusavazerijifenuba.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a6927cc65f7de511bcb18241f0dfeed3/60110233956.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb79e7a42f---1820613227.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/jufidixux.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/57207804816.pdfIn PDF document text
    • http://allycatering.com/userfiles/68483148217.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/93949864005.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85f767cad1---32108000350.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/97606230576.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/fejukunafovavovovilaxeb.pdfIn PDF document text
    • http://polkovnik.su/upload/file/sotak.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/v6r4dnupgdvtubf34k5slruij4/gevugazujesugofalaxipito.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 2004 bytes
SHA-256: 89cd01d6aaa529676cd8ce2c7b68a34e1a55fb5e8efdc7dc98a3bbd81b1f0407
font_01_sfnt_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 19048 bytes
SHA-256: 4fd40e4bae76ae7528682aaade9ea45be25b9dd981ee45f81ff0758d3cadaf68
font_02_sfnt_off00012313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 11044 bytes
SHA-256: 6e0cd171611e5a1110f0389146babff90d86d9c966c313e83ad436c22dc5239e
font_03_sfnt_off00013c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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