Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a6e713f051bcb0…

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 11:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3fa817f71942c78c76437f0e78b0202 SHA-1: ff484b431194e6754ac56da9de1dae929f3e95d8 SHA-256: f4a6e713f051bcb0fea459872a5de1ece23f9af75be0fc6d5378605151c28bcb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=good+music+downloader+for+iphone PDF link annotation
    • https://blokhol.com/upload/files/tepotebidimedavalulibara.pdfIn PDF document text
    • https://clinicscrm.com/img/files/setazekarexojodap.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/74054829473.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613509c517c6b---92031442070.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/senafuluzotegubadopasajo.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/pijoribupukorujubejulu.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/pavenu.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/17692978352.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/640fbafb57c8eb8b73c0d2e0b1f36baf/16365057305.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/piratudikegolu.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/silavobiko.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/23111021096.pdfIn PDF document text
    • http://retailcop.ca/files/95480592630.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51127631290.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210911150550.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/pasuxubupowuri.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/20926948177.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/vigitefupesarazoxeno.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1630783394851875074.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/80825949485.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109112020572935.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16133da1118847---51936643780.pdfIn PDF document text
    • https://satesayap.com/contents/files/pofixomazojinixaboj.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090906330762.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3E 11012 bytes
SHA-256: 06805098c22ff9a70dd47f87d2fa3ffdf4262971e2f33b1043d1f57c0511b14a
font_01_sfnt_off0000f6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 18032 bytes
SHA-256: 9e6e2b375d3c5523e9c671748a61deb742ceb2e0e893a05691b53325ccef83aa
font_02_sfnt_off000124cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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