Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a414039ec82dab…

MALICIOUS

PDF

112.8 KB Created: 2021-08-04 18:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 7ec2b29576104eea89e3a2ad875ae287 SHA-1: 945327871d750f75295c207cc9c7425fd8e4c4c1 SHA-256: a2a414039ec82dabab7a6562100a9573c8442632e87932b59723c1821432b070
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://queure.ru/uplcv?utm_term=navy+uniform+regulations+dixie+cup PDF link annotation
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2522b4bd6---44604796206.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29e1cb39b1---63698923523.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/suzivexagirup.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/dd6c20c2842ad7cd39247ff1fd4b996c/jixarir.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16102f57acdfa0---dewawodufamexopiwa.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/39019252663.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/vazubixotajixa.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/3jhmfom178017hdfl8r2oj4lvl/newibiti.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/bojafaduxikaburuvotekune.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/acdf3c9eb528a9534f8a726fc668deef/mekosinuwixawanerifeg.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/surimawokuzizinisome.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/6d8a414702f30afd3251c42846c4b8b0/dexidebemoboj.pdfIn PDF document text
    • https://noddy.nu/images/file/bakomozub.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/nagowojokabevupibaj.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/lepixunaga.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/vasuvawifabesudasenegejew.pdfIn PDF document text
    • https://ghnservizi.com/file/pabedog.pdfIn PDF document text
    • https://mfdesign.hu/files/file/bilulexofebib.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16100f3751cf9d---15610328974.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/kodumepugakujodovoponu.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/5cec4f97ad2c1c6e741f93b4eb36c32d/lipov.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/37e7b907f05921a14165cf9ff8cde5e1/37731555207.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_off00012333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12333 20832 bytes
SHA-256: 3400b6c1fd2df67e173a496b1046e5baae0f6982917d0a6b56eab4ee5f4b70a5
font_01_sfnt_off000158e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000170fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170FE 11324 bytes
SHA-256: cdd8d15a8d3f1007c7936d6f229da48c435e16410fe864fff2548f6a0f99849e
font_03_sfnt_off00018b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B6F 12744 bytes
SHA-256: 23a988b8a37b63dfac2a71b1fe135d3031002301440993deac28aca85642664b

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