Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d4f4b8cc0966df…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 06:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 822aee3c1e6cc77d3277d9f7ab0218c8 SHA-1: 3407075e282bb01889a8ee8fcb19471599ff1f35 SHA-256: a4d4f4b8cc0966dfebb6110148fe14cfdb9dc78ee423dc13632dfd7a09b04c0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through a link farm. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ntc-container.com/upload/files/72855499562.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/0st14s7v5s7uqd45btih5runk7/68883690533.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/bikixe.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/60838143155.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/wajososume.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/garore.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109110405413165.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/ravuroxutadazazaxu.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/lijufusuxasasajimilom.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/lipudixojopun.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/dulafuveza.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/44379392496.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613da9e850eb6---22469411654.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/88195842656.pdfIn PDF document text
    • http://freetds.net/userfiles/file/60174092699.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/muzesa.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/52246773496.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140485752dc2---bojexawaf.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/xuzosujenerimupetivonumu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327c4ad8aed---37468717293.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/pejiv.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/36287184408.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/gubuwegajukitemidedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sniper+3d+hack+mod+apk+download+unlimited+everythingPDF 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_off0000d76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76C 18292 bytes
SHA-256: 8eced4d49668205b8bf4300eac438f893667da4f0bcd4be1a50942a00701a189
font_01_sfnt_off00010743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 11496 bytes
SHA-256: 30d8693f1a56d090b52b8a02217cf4f0abfc5c8ec340fab7e23bf3c8db3e335b

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