Malicious PDF — malware analysis report

Static analysis result for SHA-256 612071c18a4196a1…

MALICIOUS

PDF

92.1 KB Created: 2021-09-04 08:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 764e712cbf3a9834c4553b839778cd93 SHA-1: 8a579ae1854c1606dde98f64da69b53d14a81978 SHA-256: 612071c18a4196a1f7c88f508425ec763b3ab3fbd4ab6d382dbd7bd9e5131205
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely downloads a second-stage payload from one of the identified URLs, which are hosted on compromised websites, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/xakanomubaduwapodegija.pdf In PDF document text
    • http://nuraski.pl/wsg/userfiles/38797809466.pdfIn PDF document text
    • http://centrons.com/uploaded/file/132733304861277fae5f398.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/83387390999.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/6360383920.pdfIn PDF document text
    • https://t2sc.me/userfiles/61672229041.pdfIn PDF document text
    • https://zold-kommando.hu/files/80859325945.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/lusofipexigebuniloparav.pdfIn PDF document text
    • http://digifast.cz/userfiles/fejuse.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/34358889571.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/rurabetapiro.pdfIn PDF document text
    • https://codecs.ro/images/file/bedixekeso.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/80772438933.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210825162308.pdfIn PDF document text
    • https://fultoys.com/userfiles/nokoxuxowodowebejafitoro.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/23496796541.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/firobe.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/es4gh32olcpqvj1em6la0p7rgq/39126114108.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c4e3ff196876e1906f757ae8776f7d46/runexovazule.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/ae0d9dff2c69f35ecd29c91aafd3472f/71649367798.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/lurexakivo.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090093c76f45---46475354717.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/zofaxudutufufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sir+gawain+and+the+green+knight+pdf+holt+mcdougalPDF 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_off00010157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001196e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196E 11252 bytes
SHA-256: f5103fcb9b4404508b40da63c04f23cf94d00b552aa7ca4c547ec6fedc9fd906
font_02_sfnt_off0001336f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336F 18056 bytes
SHA-256: 4063c7ab81d12ab2522cea58aa6a42f1093c72a2d7fd49f168a14bbb9c5b1570

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