Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4d5cfe6ba96421…

MALICIOUS

PDF

68.1 KB Created: 2021-09-29 10:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5d4b2333dde674cb22441e79aaf748ea SHA-1: 563c6bfc2441d0fb1250df18742e0e32968d68f0 SHA-256: 7d4d5cfe6ba96421876cbc486f862ee8339a2f4251ae19681d9494b5e941f02d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including a small file size and an image-heavy presentation suggesting a screenshot. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to credential harvesting or malware distribution.

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 http://proximeo.com/ckfinder/userfiles/files/36447295566.pdf In PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/bedoratirakafojiko.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/2eee989bd080da25bfd21caaaa700b17/29512029136.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/10490346318.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/e01jt5hj66n4obn9jcuevp8kp5/58391127683.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/5737389034.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/gewijes.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/32905980397.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/32029977509.pdfIn PDF document text
    • https://taperagi.com/contents/files/gigukeborozevejokoziw.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109121544199925.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/ralesanoj.pdfIn PDF document text
    • https://trexanh.net/upload/files/17367092147.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/radabagumuwiralatesuwavol.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/rarifofekonuloteni.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/zopafukugofakomutunexexi.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/wofefukafanadovakowuw.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/24310614072.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/wojiwezutojagi.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/rogadusazon.pdfIn PDF document text
    • http://klenderbio.com/upload/files/79654313306.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/vipumotaje.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/winopowaposelite.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c9b2bfdf3aa357941d260857c64f614/667901048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=free+download+scatter+file+for+androidPDF 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_off0000ae67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE67 13896 bytes
SHA-256: 82d5feee891b72509e69db9ff4ab758168dbb5048fc3687bf166bef6cd42659f
font_01_sfnt_off0000d0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B1 10532 bytes
SHA-256: edf8b9708eaedd4b1e5a8610da074eca3128c788be86e965c52c02b60213224c
font_02_sfnt_off0000e8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1