Malicious PDF — malware analysis report

Static analysis result for SHA-256 5492d800c6f69be1…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 23:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ea632f564ec2f4272aa3ecb495f3812 SHA-1: 3bdda203aae64e891086bb808fb1e1cc1fa2596e SHA-256: 5492d800c6f69be14b9d09668bed4609a7cbfeb585bb0343f610d3a86d78b766
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to compromised CMS upload directories and other external sites, suggesting a phishing or malware distribution attempt. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16131487c030c2---fifazutisarefej.pdf In PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/tifewarevozufobatigotuko.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/t2jpincg69iabk4lsb7gmh81qb/43921311307.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/popabawoxusisemofog.pdfIn PDF document text
    • http://samtekelektrik.com/files/52701972991.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/jireladi.pdfIn PDF document text
    • http://platcometals.com/images/file/21875951965.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141c11a71df8---derorekokanewodujagede.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/56962939649.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/fopapo.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9eaac9105250a7e39641bf881ae4aff3/zovejusetilik.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/gipiviwikosepufilape.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/50068685893.pdfIn PDF document text
    • https://cartolmania.it/file/gekojazabokekipakanoboxo.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/wodukin.pdfIn PDF document text
    • http://gekon.net/userfiles/file/jarexepokixukeba.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/10872676740.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/47187865797.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/favubuj.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/wutujujotujuzimuxari.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/35375687145.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/16552305876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=storks+full+movie+online+freePDF 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_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 17496 bytes
SHA-256: dad2f42c9c15968c4180176e36ce174885a7de0bf4e063326344456efd9b6fb4
font_01_sfnt_off0001046d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C84 10548 bytes
SHA-256: 72d66670a4ccdf6e3afa5f6a2a2a5467186fc104e842032efb1f468f55aeee07

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