Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aaef3faf8720b91…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 07:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f2dc7da62342ff40d05b6e049126329a SHA-1: ed58af05c15cc80c29fa3ef425c45d4ccd1147e5 SHA-256: 4aaef3faf8720b912eb9ba5ab94b1b1869ec2a1a189cf882ff6b681ff9a96082
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=don+quixote+pdf+english PDF link annotation
    • http://happyorderfood.com/uploads/files/49714568504.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/wixodu.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/wokejinewiragag.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/856qfhlureokgt4iua4ppe0do2/72718179265.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/matajifugi.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/19532362267.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/27092521790.pdfIn PDF document text
    • https://begili.com/uploads/image/files/keliwigov.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/bigudepafitiveduwumusewa.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/92257560535.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/kur0415ff6hv4m87p906kbphed/86926415223.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/81062020490.pdfIn PDF document text
    • http://accronline.com/userfiles/file/mutilab.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/xazesurujisile.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/4ed3043cfcca987a914db843883ec03f/24951952420.pdfIn PDF document text
    • http://garderoba.sk/images/_file/kutap.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131678a1cd02---tokexoduwirefel.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/gadidaxagikirafas.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/78850960443.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362bba05bfa---8740606324.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/pelem.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/wonetuzumovod.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210913_C67655E133B5BED9.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/bapovufaniti.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109160755371976.pdfIn PDF document text
    • https://ripedesign.com/app/webroot/files/fckeditor/file/47688577390.pdfIn PDF document text
    • 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_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 18224 bytes
SHA-256: 25adac72e702e7f9aa84665d7e0db294d2cae79e68a2134ff6d31e9707170546
font_01_sfnt_off0001198d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198D 10864 bytes
SHA-256: a6e7fa664b767e09e8f738e825c1220fe6ab8c3707bde057c10d1e89d1ae5939
font_02_sfnt_off00013209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1