Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d360f87f1e887b0…

MALICIOUS

PDF

72.6 KB Created: 2021-09-18 04:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9b5458acbb33bb0dfc74a432f5d1030c SHA-1: 40c61fe3deca006e97bc3ca853c6eb427572ed3a SHA-256: 8d360f87f1e887b0351141d18bc543cb9cb34ba9798c540979de25b2cd248754
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely to distribute phishing content or malware. The presence of external URIs and link farm characteristics strongly suggests its use as a lure for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=naruto+ultimate+ninja+storm+4+mod+ppsspp PDF link annotation
    • http://alphasigmaoverseas.com/userfiles/file/rasenizojojusaledeku.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/pevemalojip.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/majapebulenotepebuxanav.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c2354f975---gukiviserakoluxidaxipofa.pdfIn PDF document text
    • http://salt17.com/userfiles/files/durijidonuzovobalob.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/23007798755.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/96717457578.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/84702149605.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/44038835099.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/61937500530.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/32639225824.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/zozofip.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/1397126e4c5085b88c231952cbcc6fc9/73153664667.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/11840199063.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/3cc3b14d851bd51ebc552c804e7b1341/33746199803.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dc1dc612b311292aa26d00cf5225a191/nofitolipixavofax.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/rojetug.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/23890347344.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/18374888821.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/moxajegivulujova.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e04d96418a29334289595a9ca87b60db/18571006219.pdfIn PDF document text
    • https://airxps.com/userfiles/files/85664621459.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/3927753811.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/gemadozufaxala.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_off0000b953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16A 10840 bytes
SHA-256: f0f8a4e54467ac8254d259a215cef89de04d4fe032026153c4906d762701ef80
font_02_sfnt_off0000ea60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 16516 bytes
SHA-256: 0c5c7a9c02d593694fe7de69e759a00bd2d65cfc5dfd361c616b44c805ceb38f

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