Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53e425567358d68…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 04:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dde354b74a3edb214f918e5b6d5fb830 SHA-1: 4ad8ec13a9128d8a6611a23ab53da51e722b853b SHA-256: a53e425567358d682ceae65e0048df912966bafa41779561c9dd616bb4e7a318
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects users to external sites, as evidenced by the numerous external URIs found, many of which point to compromised CMS uploads or link farms, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://listapp.in/ci/userfiles/files/7756995839.pdf In PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16134de810a35a---ronimituvo.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141835717225---xofabuxekibuguzaruvig.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/ditibuzopadaxeruguzopo.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/genawonoji.pdfIn PDF document text
    • http://honghuibio.com/d/files/56785926897.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/89023539805.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/voloremozomun.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/69221353907.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161368418d00fc---17672647486.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/mofudebikokubopaxo.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/33770286306.pdfIn PDF document text
    • http://royalgroup.at/tmp/43402287798.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/97084796094.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/94390940103.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/72297439282.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210901225300.pdfIn PDF document text
    • http://royalgroup.at/tmp/mopoxofimis.pdfIn PDF document text
    • http://micruts.org/userfiles/file/begotolidoxofikudavebun.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/xapetuvogu.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/xepalumofivazodarabajesu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5e9883ae4---49286653178.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109030007212835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=machine+component+design+5th+solution+pdfPDF 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_off0000d915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD915 11196 bytes
SHA-256: 452672b75489e889e1ca3fc7d1f4a1710c04b2252f7aee19ef29f12e1cf0091b
font_01_sfnt_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 17568 bytes
SHA-256: 958952ffa788be6aff71bbd8e0e7e3c1e660705ab39cba06c969a65ee9f222c4
font_02_sfnt_off00012075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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