Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ce23ba43a99017…

MALICIOUS

PDF

111.7 KB Created: 2021-05-25 06:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e92317708c172539edd14d078f898980 SHA-1: 7a5acd72fe380279e7076b91360691c59e3bacda SHA-256: 91ce23ba43a990178d101b0fe737d737d3856f715f20769280acdebde6446e4a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan. The heuristics indicate it functions as a link farm, pointing to multiple compromised CMS upload locations, likely to host malicious files. The presence of a 'download button' lure further supports a phishing or scam attempt. No scripts were extracted, but the overall structure and URL patterns suggest the document is designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b3b692873c410b2ac4786f9956dedbcc/96523567133.pdf In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a90876d69---15743581835.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160740cd19eb91---bipuniruvatonoxedonugemuv.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5c83869ccaebaf543b719f960c0af1bd/sibebotinipupo.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa314ba3427---bexitadujive.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1962ef35b---tedanemoke.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/35b686649cd1ec0cbcaf3ae3b662b8b4/96456342679.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/561cbe12b0979edacf870549f6631ec8/wawepogojenijewuzoret.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/21d051823ce7e8d9c55e5abfd36fe67c/radejejipunof.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609472737b8af---ruvisefonoxapan.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/aa869db74b17a024201de36c00a910c1/60946978792.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089862799195---digijasipuvodavezutoke.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/momopowefabemenidazegig.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/7eivt55cnsg662ai37bs9up6ps/migujat.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fea75ae4e---57973590788.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed4d2d5a8---39035675510.pdfIn PDF document text
    • http://charivne.info/images/file/lopafenodoragirol.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/sozumazisorugad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+write+a+critical+response+essay+step+by+stepPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CC8 5008 bytes
SHA-256: 916a6a3cbe54c31d8d4b26bf9fd81747446834d5124a6ba5d4d07eb492b67714
font_01_sfnt_off00017de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DE8 10900 bytes
SHA-256: 5167437535e6befb238388d3844ca0360e2647145e0a803ff976bb462e4a1233
font_02_sfnt_off0001a256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A256 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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