Malicious PDF — malware analysis report

Static analysis result for SHA-256 624f02fa1c548242…

MALICIOUS

PDF

85.3 KB Created: 2021-09-01 14:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f36ae58ed9bc4935fa80136a462c8b5f SHA-1: 25111e34e6d65b68984b6b231fc586bae09bcec5 SHA-256: 624f02fa1c548242dda853481b49a0ca66b3abeb995b3206d9e2ff3b581870c5
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised websites, some of which host further PDF files. The presence of a 'download button' lure suggests an attempt to trick users into downloading a second-stage payload, likely exploiting a vulnerability or delivering further malware. No scripts were extracted, but the overall structure points to a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://area34.info/wp-content/plugins/super-forms/uploads/php/files/dd11snpm273o4unsje49brb5k4/guwulupefikazaxane.pdf In PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/91337698887.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/73752932656.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/nudidoparefutubu.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/59260483708.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/94323505179.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/bibopijapole.pdfPDF link annotation
    • http://eiak.org/upload/editor/files/tobotolififuwunazobev.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/63c74f5thg7srgjo871kqn4lv7/41801405579.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16100670020889---25001902079.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/kewanuxakexolatanikipon.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b813ca123c6---figalonokidetajukok.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83fa62287---subadunagifufiba.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080271aaeebb---36833804443.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/baxiwufutubepeju.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/gijoduwel.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f280ef1790dea423a6a2f900d9e55dbe/kedaxumazip.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/40401130391.pdfIn PDF document text
    • http://0851gay.org/userfiles/202108file/2021081707431570554.pdfIn PDF document text
    • http://abpaluso.com/upload/file/kemigenebiz.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/ce42f285ab4ad24b6e96757fb900aca7/lurixanoridipifupil.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/46ce7d87d6aa9814d3f35a7df50fd59c/xaxoxuvifogux.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/999b82f22cbb65096eb428b3bdf78a66/26325118362.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/zusudizami.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ok67sq17rip2rdc435fdqpas6l/94463064137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=product+key+excel+2020PDF 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_off0000eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DC 17444 bytes
SHA-256: ed84c44cff9a924b995bdbeea614475cbce5cf577039e6cbc44286b0036f917f
font_02_sfnt_off00012fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC5 10488 bytes
SHA-256: f7ba47ec4861430dd2142f454f4c699c76ec4b4226f1127f0d178cb005266416

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