Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c8e979542286ed…

MALICIOUS

PDF

411.1 KB Created: 2021-06-26 14:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 221901e1eae9456fd7311a5d581be3c7 SHA-1: fe8b5c69aca521bc8ccc8724a471d6c779b0b7e9 SHA-256: 22c8e979542286ed93627b20a28e543542fbeb1e5fbd0738fa0b93be9a0440f8
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript that likely attempts to exploit a vulnerability to execute a second-stage payload. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' indicates the document uses a lure to redirect users to a download URL, disguised as a search result for a technical manual. The presence of multiple compromised CMS upload links further supports the malicious intent. The embedded JavaScript and the redirection mechanism suggest an attempt to download and execute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8978

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=dell+powerconnect+2624+manual PDF link annotation
    • https://newchat.xyz/js/ckfinder/userfiles/files/koxobipilazu.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/37839339004.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/ad714a8382101873a3a270b97ccbb2be/veloliwumupema.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/24bdf672d5f7ecc310d8f680ce0f8cb8/zowesekigujik.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/43614164378.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f85c4324a---68469023290.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/p14fd9vo2c5dj64slumdfr8ne6/1154404976.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/95001009521.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16071ffb16b4ff---datanujovufu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/b0dc89b4b6fd8e3c3c9cc56f26725778/nosirisudajawebebojo.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/gegozenixubelazoz.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607362a8a411a---85617732602.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607593a08cde0---67811951118.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/c039604bdceed33828e717a75fc043a4/xopojazosa.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/0cc009b5e5af6f4561bbee1f18ba93a0/50707882343.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b998153bf3---95341935175.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/22883664405.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160752262d74a1---79522313530.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14c283bf79---22456578474.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f12e27c0e---nibezaj.pdfIn PDF document text
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/59333898597.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7c1b41aabb7500e3b095b14d2c796cda/33661448656.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/1481891956.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0005e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9DD 10828 bytes
SHA-256: da052abb4433f865065ea544e04fde3e68d66348e5e0ba1675f6919fa192eee5
font_01_sfnt_off00060302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00061b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61B14 25176 bytes
SHA-256: 6f8ba58b9b542bbd0386ed2f93ac7fc566ee3cc69d0be323b9c176073727e5fc

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