Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d8135f7374d67c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-18 23:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d13608e2a68dc3f745f5e0151f880d22 SHA-1: 35c4546c25ce1ed799edeec2a381e5f1f4584c3c SHA-256: f8d8135f7374d67c7a9b24ba2cde0ad6a07fa9b4b806eb9116f42a42f10d8b34
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=shri+balaji+ringtone PDF link annotation
    • https://uetty.xyz/js/ckfinder/userfiles/files/70316835411.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/gigivomava.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/vopakitototaribiduriva.pdfIn PDF document text
    • https://techlan.pl/files/file/tubixomedofevidegadalowe.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/51522392573.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/50516071852.pdfIn PDF document text
    • http://luyutea.net/v15/Upload/file/202191694828599.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/nadimaxobixo.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161316be13904d---53202302642.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132553d4e319---98967493068.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jequs69s0gvgloe1sh359gr9ka/meduradivugigagasovuwos.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/55048780259.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/visexatejoguxoda.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16140f6e086b57---10279928945.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/xetolepadakepusedaxepep.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210912055234.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca00edadd---zebijesi.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/34802648693.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/degasevuti.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/29054231371.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/pj3cqav9rku14qati9hnvs6lnq/nimid.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/38662862727.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/16048771110.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/rezopopa.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_off0000b708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB708 16200 bytes
SHA-256: d725e63565ef42ac2f429e5cefd22f5af9d41108a72f5c5559a1bca7c7422c1a
font_01_sfnt_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 10564 bytes
SHA-256: 4534ef559a176ce5cc01d965d4f5c73dcedf23e7074ec6a2851bc179cfd008ad
font_02_sfnt_off0000f849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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