Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9c89afbd0142d1…

MALICIOUS

PDF

103.0 KB Created: 2021-06-28 21:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 82bbf9e689e377c72bcb14675d29bb15 SHA-1: 97bda52e13f31cb904f1a32ad2915424f0a6490c SHA-256: dc9c89afbd0142d1eec284355c3eb0f372c4b449eb25aec98ae14c50b1329429
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm hosted on multiple compromised websites, directing users to download further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or trojan payload. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/179cfa97e2ced80f4d4d9e2d531e9a1f/jokerizejotigomeve.pdf In PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/4pr2nju9u65ri52jmghhvqjdts/jekedewuposafo.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/90293114019.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee74ce572d---maxakenonogelekujuvar.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16079d9aa95919---56625037849.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089da7e4983e---nerafobovufuvujim.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/22021934893.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b8bc226e53318fe0293f08083de9db3f/zoruverinuxoruv.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/398ffef75e62d4e46524636d9eb1eedd/rerekofuwololo.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97cd010cd0---sovitazozopanewipexene.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/47334831174.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05b7b08423---46642768914.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/buvutewanepadopomexav.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/bfbfbfcb8a3aaf4e0101ea6f20c9f815/kipazawufejeferasiv.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/6tejnbihdung3jducce2d0jbq7/futegebididage.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084792e78f46---susuweworosotepid.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/62f3aa9bd8df0ba6109c532e66cbbd17/73529883365.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8e4a03581---44896498252.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/fenuzalefopoforogaz.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/78702172126.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070aef049ee8---midaximalamu.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084e86785660---tifafajunabikukulezozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=jee+mains+2018+maths+question+paper+with+solutionsPDF link annotation
    • 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_off00011185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11185 19388 bytes
SHA-256: de18fdfb62f326a82d04d66bb159eeffade2ad45a80de4df61aee3d73d43dca6
font_01_sfnt_off000145dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DD 16092 bytes
SHA-256: a37c6052708a11292b84d6ddbd984f933181f63e6b3fea8565785f9b56dba974
font_02_sfnt_off00015b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17332 11344 bytes
SHA-256: 646b62472ffe49a580c0f9ad1840b05deffeede6748e974149585287097c3359