Malicious PDF — malware analysis report

Static analysis result for SHA-256 7757f3453d013b57…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 10:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc06af5f6e41aea4dad19fbdbd17136c SHA-1: 1c8b7dab22c4e46bae7290ec0d7b219c6c381dc0 SHA-256: 7757f3453d013b57791b850b3c62af775618e2689635a1ce81f704e81aa0e396
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. The presence of a 'download button' heuristic, combined with numerous embedded URLs pointing to potentially compromised CMS upload directories, suggests a phishing or malware distribution scheme. The document likely serves as a lure to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=kong+skull+island+filmywap PDF link annotation
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144414d1dc8d---94417829771.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dbe0919ea---naxovusawarudelesen.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/45090757562.pdfIn PDF document text
    • http://dnepropress.net/files/file/22196550533.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/703599518.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/94767071063.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/9348502927.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/rafimewuwojinifapap.pdfIn PDF document text
    • http://rurisnet.org/images/file/98864729216.pdfIn PDF document text
    • http://www.77ice.com/upload/files/56195511782.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/dagovefumube.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210904195631.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/7306362692.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/70003545756.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/10707682693.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/rarelujije.pdfIn PDF document text
    • http://att-na.com/upload/23361370403.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fab09c7696020ef3186553840d62eb60/lodebenuzolajidoramez.pdfIn PDF document text
    • http://sjanzee.nl/file/13903108673.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/polotixot.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/wukojipuf.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/dipejotoludog.pdfIn PDF document text
    • http://annabarons.com/files/files/80282134395.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/37692502932.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_off0000ceb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB4 18476 bytes
SHA-256: b4ff4ad7b3e81ab93c6515b8be6a71da5a2f86f8b22a91ba3ad6ce43bdebdddb
font_01_sfnt_off0000fe98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AF 10896 bytes
SHA-256: 330714d0a7632dae69acfd5a1dbaa4361d266293b91e65b175560903cc63db9d

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