Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04328a25ca4684d…

MALICIOUS

PDF

77.4 KB Created: 2021-09-20 00:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: da9e74bc14840c21a36a7fbcd478642e SHA-1: 3ffaa8fdb4bfd28b938a7e0a18b32c4544a470a6 SHA-256: d04328a25ca4684ddda1cf43fddca66305eb51cf25945742b6a52127279acfa1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://motoren-adachi.com/js/upload/files/vuxejugodew.pdf In PDF document text
    • https://kenhquangcao.vn/uploads/files/napalitobijabip.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/daxefegowitowofubugepogoz.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/6878587492.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/wunuroteteniwexaz.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/jinokudaxuxan.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/63026295508.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/9f59e4596c6cc294e3ff0613e6f5be30/68319300474.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/15872718310.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/medukilowakani.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/futobafu.pdfIn PDF document text
    • http://tatooazh.ru/files/files/pufexoxonogivutafadaxewi.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/26659528302.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210908025849.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140946040841---72947992406.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/29388759723.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/mewokigoxizaxunigo.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/8973814380.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7522ae6fa47f2ee9cab982f3426e6245/wepifenosow.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/74918280687.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ebb338e1c---21482969735.pdfIn PDF document text
    • https://el-tall.pl/pics/file/35066318199.pdfIn PDF document text
    • http://vhz.cz/user-files/jowifiruponuduvuminulu.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/8325a7e92744f2314d31547e5042b811/tidonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=hd+live+cricket+appPDF 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_off0000cce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F8 10264 bytes
SHA-256: 338e95cc3bf2145399effb5d1a663a63108563736a11f7926b9c2b2e99158594
font_02_sfnt_off0000fc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC19 16980 bytes
SHA-256: 100ddbb027f9bfbc3cd05a5441206dcd4e0b0fc3596c78f571a519ac0f3f43eb

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