Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd5bf266895ac98…

MALICIOUS

PDF

89.1 KB Created: 2021-07-30 20:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 4372ffc4a54e54b1f439114e547a41f8 SHA-1: 0d8d6086dfb64631d211c8014dd191be2f28c1e3 SHA-256: 3dd5bf266895ac984c6b2a3e62355ab932af60d89ce587339733396bb0d7ec6c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to websites hosted on compromised Content Management Systems (CMS) or utilize disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • 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://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/r9i66co5eqe5a9sala2m8b7850/besidiroxodex.pdf In PDF document text
    • http://aarogyamedico.com/userfiles/file/17842103493.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/15984584550.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/nozegunupixokemuji.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/25257598911.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/jekorevuvagi.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/4497db3abd47ae00874d5bde04c8986b/49517672690.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/e2fa4f15ec85ad3207006684f88716f4/99336834512.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/26854767842.pdfIn PDF document text
    • https://airbays.com/userfiles/file/43151564004.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/8334982295.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16070ed2a6dae2---63285164040.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/37d552d7920640f57798cf36cd616161/bosatesusi.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3db1b5df7---37996072974.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160be38f2ae31b---47075033914.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210613031721539.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/24644474710.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b584e2b07d0b6c74e539947089a091d6/tosekunoduxopexom.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095ca4a07421---gejotij.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/21074675446.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094824c9cc4a---84871520737.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j5d7cb7j3j84qovchoa21qs6d4/44709197527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=can+you+get+space+engineers+on+xbox+onePDF 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_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 10992 bytes
SHA-256: 50028731148f9c480e65ce4b9b63b3af3537ad1de989194e94f2da73f9356408
font_01_sfnt_off00011297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11297 16796 bytes
SHA-256: 308a13412598e0f71a5e5d36d8a8f9ded63536cb5823a1220707d8dcb4303ac1
font_02_sfnt_off00013e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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