Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32b307f4a06d28d…

MALICIOUS

PDF

68.0 KB Created: 2021-10-03 18:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4167a42ae2c034df1b0409dfb6a90894 SHA-1: 06dcb0e052a00e608d7adf54b719f9baf689f884 SHA-256: b32b307f4a06d28d673d8f367fe1ef3914e33a88da07e40fad402de7e9793fc8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only document designed as a phishing lure, indicated by its small size and the presence of a click-outward action. Multiple heuristics point to the document being part of a link farm hosted on compromised CMS upload storage, suggesting it directs users to malicious content. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a dropper or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16151946329a47---fowimifomejedegolaxufiwod.pdf In PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/belamazanakem.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/910084264.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/86068525906.pdfIn PDF document text
    • http://exim5.hu/_user/file/76610342597.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/29209751973.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/zowanoda.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/sesekakubuzuxibuxujim.pdfIn PDF document text
    • https://shidoremicrosys.com/media/zikab.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/tugipuzufulafonux.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/muxumawugumerewevowubu.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/24712937703.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/pomowikofiferifebujumelas.pdfIn PDF document text
    • http://stonebreaker.at/tomovo.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/tebodepegudobalaxew.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/98903504820.pdfIn PDF document text
    • https://anup.bo/images/files/8592195352.pdfIn PDF document text
    • http://medigroupvn.com/upload/files/54127033278.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/76749368572.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613341f6b07fa---85220720601.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145cfcb4f82c---vutubevejoja.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/66243913438.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/saregilakorirugi.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/dukabaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=hiit+workout+routine+for+womenPDF 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_off0000ade3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FA 10268 bytes
SHA-256: 67f0d11c0142952ccf5236a9f93b61710e5239e56241fa9dd6d3cfddc4037788
font_02_sfnt_off0000dd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD15 14292 bytes
SHA-256: 491ad9cc93fb3174259956f19534a2f18007a910ec561d4dddc3ac92a4511835

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