Malicious PDF — malware analysis report

Static analysis result for SHA-256 570a5a0d7ce6ea57…

MALICIOUS

PDF

78.3 KB Created: 2021-08-30 20:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e6591c4b5a78aff873f4f75fd12aec1c SHA-1: 53a22822ef22b1185d0e30f9aa2903f1849d9295 SHA-256: 570a5a0d7ce6ea571a487d7bec315fef08af0d29c30909d326f611db1e883f63
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs, many pointing to compromised CMS upload storage and disposable hosting. The embedded URLs suggest a phishing or malware distribution attempt by directing users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://gamax-motor.cz/data/dokumenty/wolisaxep.pdf In PDF document text
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/zesiwefif.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b669ffa18fd---14619270464.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/86916a00c5a48482e828a1b407a246e1/83692952910.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b05b140faf3---fukumidi.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/1232359993.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883ff54cae9---47569190011.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/efc9c20cdf2146c3c6d19f0502ff9a8f/nuwadalokizazul.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/wizotovelaguberafo.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/88602431b388cc0f8d5296207942f3c1/lunebozesajewin.pdfIn PDF document text
    • http://lulanjina.net/upload/files/42998636135.pdfIn PDF document text
    • http://servmed.net/userfiles/file/70044894554.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161199bf764d73---25618570689.pdfIn PDF document text
    • http://protok.pro/upload/files/78607850796.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/a5dd3a36ea9952fb5347d66486565d74/neferewuzewo.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/1522127475.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0e4b66cac6acd61392f5ea2f35d79f8c/151521816.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/dsitmv7uda4a9v27d569432jai/rolodimolela.pdfIn PDF document text
    • http://fullx.net/files/fisux.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/34072722610.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/35506039438.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/puretet.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ccfca95fb---ruloxuwupanexidiwatit.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16113fe350346a---lusafejavejupe.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ehg89v1jo31g6mmto2n2to74ji/gesulaveperavo.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b915beb6a93---zatosobed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=advanced+thermodynamics+for+engineers+solution+manualPDF 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_off0000c6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B2 19272 bytes
SHA-256: ebf85a8cfbab52c61189524de7d19e8b59d90027aa88c879c0d5f3b906e59e2e
font_01_sfnt_off0000f7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11015 11184 bytes
SHA-256: 9c4dda89f2cb995a4fb0d3644b2114ab37e4c7e4762093083fde87e7541aadb5

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