Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d749559362489c2…

MALICIOUS

PDF

87.7 KB Created: 2021-08-21 18:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fc4ed597b26ebeb56c02f2dfdbbbd9fc SHA-1: 8afa63966f1d067e6e5af93716fc978a6a705b17 SHA-256: 4d749559362489c220b0a4d44a1ebc9d00be333f81ee765097e242d7e7f7818d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, with several pointing to compromised WordPress upload directories and other potentially disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis suggest a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://aspit.ro/imagini_ws/70793520230.pdf In PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/kudazuvuzagene.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609579650af3e---73663486768.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d12e690f78---15915602881.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/ac7699f15238d7f1fc0e8ae573680026/86410593560.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210719022428_ohx6xj.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/pifutet.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4d3a56c39---fekosomofegefuvevi.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/povaz.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/godukopobedazikeruvapu.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/2413176382.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca9ed3b2e---tosumezo.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/74c889de39e7d355ae2447950aef2e8f/bujaxe.pdfIn PDF document text
    • http://dakmet.pl/upload/33526966851.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/34107156945.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3531c3695---nevulato.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/takifo.pdfIn PDF document text
    • http://e-hematologica.com/users//file/sulugoposet.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/bemisiwaxabopobolosi.pdfIn PDF document text
    • http://canadanur.com/resimler/files/ziremogowobazo.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/fexizoxibumodanabaloba.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f84f7d0b3e---67308269902.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739cac9a453---14077822757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+set+up+hotspot+on+hp+computer+windows+10PDF 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_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 10920 bytes
SHA-256: d6225734271ca4fe029f7960e064b81009a551404e1efed1b78dfc12e4668ca0
font_02_sfnt_off0001239f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239F 17468 bytes
SHA-256: b2c05b886e0867e059a5b15a554d60f353d601727fc08f23ff96e1974b52835f

Open this report in the interactive analyzer, or submit your own file for analysis.