Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b678bcb04e920c5…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 09:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ad6c8d0894fa6f09c6b9c71dbab0bda9 SHA-1: 8e506a6a09d92bae398a19dca63094392f75068c SHA-256: 5b678bcb04e920c5a4141d688828a3e8e1a31df9ae66b4bf59362c05ea99570a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and is identified as a link farm hosted on disposable or compromised domains. The presence of embedded JavaScript, combined with the link farm structure, suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content. ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=video+editing+software+for+pc+free+download+32+bit PDF link annotation
    • http://prograsifkalip.com/files/gizitidoxurug.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/zugisudofatepukurufufabo.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/dusivuges.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/26685631130.pdfIn PDF document text
    • http://24cvety.ru/upload/files/fajepeduvo.pdfIn PDF document text
    • http://dpkwi.org/userfiles/files/jetupidajesurome.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/b64f7b62c5621e141b00e3fb32099552/xitow.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/zokaxudadawafek.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/rawixusikibikiwutomo.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8397565c372c6e9cfe7346fa33ab48d5/wivorejemipitu.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/gasusemarivutotidevebazu.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/11372392339.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/nixese.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109130454093420.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/dekafojubufadisibenobulu.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/wavaxidexowiset.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/dilibisulire.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/nizasaladu.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/54963461626.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/19120473558.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141de318f908---7842753700.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/10501274726.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/tugugusazetesatanaw.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_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 17540 bytes
SHA-256: 6bc329996ff07fa3c5e678f6a5329df32ef3f5a2a3370bc9a9047dcb9aced648
font_01_sfnt_off00011937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001314e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314E 11280 bytes
SHA-256: f1de6b0b4f4b7731e62e5e5e3ef9cfa005c9d0b05d7f5b40f2bba53ce1f9dd24

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