Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef71f089b72cb3fd…

MALICIOUS

PDF

103.4 KB Created: 2021-08-09 08:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ec5611c896c5d00d9a0cafb7e35ae49 SHA-1: 75b84d65ebbc3d10808872139cc0ec280590367c SHA-256: ef71f089b72cb3fdea58c8d6979a1e422001c6d333887e539374a668dc41b3ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kavtas.com/images_upload/files/4055567137.pdf In PDF document text
    • http://pappteam.hu/userfiles/file/30964761002.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/84199157590.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160759d5eb42d7---42980863992.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/imoh1g4kalsvi5alogu5ejm95j/xateturefasovoxodunaga.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/77687712117.pdfIn PDF document text
    • http://vincentpopetutoring.com/clients/d/dd/dd6b7bcf94cac99d3bed97cf8166637b/File/534456441.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/zukalujita.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/telepamupazawijan.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/xafofajilug.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160919010671ae---zorewagotefomoz.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/13613936374.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1dda839a3---83675031160.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/kuzapemoxigikosofewoleje.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/mifekujimitobife.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c9424ecc64895aa4d03b2096c4b2d7f2/45129418196.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841a153919f---97817014150.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/17226778695.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/bmq1f30r975i1ebd8pdb2uihi5/87785070639.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5b9cf37c---xodujal.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/62043427976.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/12c3f484ba32e9703440365f486b1f61/romagetuvuwavazugit.pdfIn PDF document text
    • https://rcot.org/userfiles/file/46173856631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=does+covid+19+really+cause+ardsPDF 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_off00012e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E36 18600 bytes
SHA-256: 029d5e9b7c0846a190959f1bbd4cf11764348ee6e6969e390d2b2e8d6ea757e2
font_01_sfnt_off00015e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001765f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1765F 10660 bytes
SHA-256: f2a6df87ebf2240114f77115fecb6739239d06207d13537f4057b97aa292dcbd

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