Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f21b5d41c0fca8…

MALICIOUS

PDF

77.1 KB Created: 2021-09-21 05:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f4b4b588312bda0636e91dc1e1ba5628 SHA-1: 54523cdad44a5747170903f6332479ef2dfb4907 SHA-256: f1f21b5d41c0fca892239805cfbc98d1fe17ecdc7793486b63036912e55f2474
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://grgct.com/ckfinder/userfiles/files/gavoxopeluziguvesamen.pdf In PDF document text
    • http://pierrevillers.fr/mairie_files/file/nedurepop.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/58790f4bb8d83c8698518a2eb991ee60/ninefisowiga.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/67177632266.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/88033071296.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/kexelalewidapukazib.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/sljcnnpuf94c3alf93seil19vg/23313449739.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/71600123525.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479025427e6---fakibar.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/38569040571.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///romudanebuluzisoz.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/topimalawiw.pdfIn PDF document text
    • http://brukbet.com/user_images/file/15475047702.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/vonawosokuki.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/gezudata.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/99573960865.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/62362786746.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/lupefovovavajirije.pdfIn PDF document text
    • http://ladna.pl/user_images/file/vovarejisojenalalugekinin.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/notovijudepejizoxezufaped.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/midokamaziratefo.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/19763263864.pdfIn PDF document text
    • http://ranchobg.com/img/file/18581624147.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/zosusikulewuki.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/30050414578.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/71928844664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+do+i+transfer+pictures+from+android+to+computerPDF 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_off0000c9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D8 16532 bytes
SHA-256: fe357fc2aadde8f9ce621f2d7635ea688c96a5212857517c2a69164a87df4400
font_01_sfnt_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 10912 bytes
SHA-256: abd1a7c503dacbac3f91071795a34422e8b03652460f7d63a1a9187b5cb79c9f
font_02_sfnt_off00010dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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