Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2cc9a973d334ca4…

MALICIOUS

PDF

75.2 KB Created: 2021-08-03 16:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e1644f99da4184394557d4137689a8c5 SHA-1: 8899a9cec1c29ce04aba0fa518af3a6ed4913206 SHA-256: a2cc9a973d334ca4cce8d9ee4f6f85a3add4800af4a75bb77567239943109d51
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal a link farm structure, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this. No scripts were extracted, but the overall structure and URL findings indicate a phishing or malware delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • 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 http://mpti.ru/userfiles/file/90740469524.pdf In PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba5a928b4---39008589568.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b54d0c4c3---79362263174.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/ramibijelevoga.pdfIn PDF document text
    • https://projetovm.com/uploads/files/wenujire.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/dezixovoraponawufiwex.pdfIn PDF document text
    • http://mylodge-naoshima.com/88989905832.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/89055987057.pdfIn PDF document text
    • http://agiteam.org/clients/b/b0/b0c4817036ef1cb73596cc935f3fa86d/File/muwetulutupuvitiwesobule.pdfIn PDF document text
    • http://camonetinternational.com/files/file/zuziraxojupimefudevovoke.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf452cf68b---vopilorav.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160aa88703bd3d---dovukutafojumesuvabumol.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825193d8521---xibapug.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c55d119b4fe---xupukefumulu.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/noxezonosebimikam.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/84095169330.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a322f3120ed---wumopirixefedovijaguzima.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/dfd75820cc4a5af26a1c8f7f35d8a8d7/narebul.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c3226e8a4b7ce84be1ec3625db0d3cc8/20260799670.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/eom6te6te42d4qji3u4veo7g42/4949420080.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/ad35ff34d602aef7ace4281f24d9fb08/jexigenivek.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/naruridetemanuxoke.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/xafubabiputapoxapirut.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c4485d82c---vipibimisejo.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/43034874538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=probabilidade+e+estat%C3%ADstica+para+engenharia+e+ci%C3%AAncias+jay+devore+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE25 17556 bytes
SHA-256: 5ffbcb0b79700ba365ea169646dd567b6acae900cb397aa96f1226dd30735652
font_01_sfnt_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 11572 bytes
SHA-256: 9025a3ac7644aad29195f4ad33b0a00fbc88f3b924fe69a4f95ff2f46d03afa2

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