Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7829b804b9fc93a…

MALICIOUS

PDF

125.5 KB Created: 2021-06-28 22:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a090c4b4605c98e33b506a8808d8858e SHA-1: 2fdc486195f5998c52b2951be3c9f0bea1e2c0eb SHA-256: a7829b804b9fc93a92e5cb97d0eb9c5460e3d47e0d05c73c57c701f1fa5eac23
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, likely intended to trick users into downloading a secondary payload. While no scripts were directly extracted, the PDF structure and heuristic firings suggest a malicious workflow designed to deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5371b41169---sutasokobaperiro.pdf In PDF document text
    • http://hzzxtl.com/UploadFile/file/20210617183221828.pdfIn PDF document text
    • https://led7.ru/file/36193882666.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b3794669b---65774190051.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/b200d046abbe9487df4a1f2458d5aa75/87990460535.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/75053688773.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/26717221367.pdfIn PDF document text
    • https://digicpictures.com/downloads/18125394977.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/6efe014d2411a65ff335ef96ec6a4396/sutasujunejose.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e7d420fd---7845824875.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/90f13c500230fa683674080f9e9b03c4/riwosabiwunudefowadakexeb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1be6c09481---buxuwag.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/rokegafuzafo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f441c77285---45892113339.pdfIn PDF document text
    • http://asustainable.com/global/file/21219042508.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ee680fb7c---11351595771.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/bdfc82e167bf223339595767a4c48138/zutukowalexisanebegebivol.pdfIn PDF document text
    • http://northcity.rs/slike/files/78016361248.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/523bd536e478b866ce69ae75a8dd0b3e/jitowujazaganenezazugenib.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69d6d2b9d7---binitejibatum.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/vilobokabudujupu.pdfIn PDF document text
    • http://enerjipiyasalarizirvesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d68caad15fb---peregokimafolumosenepali.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/57325034409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=end+to+end+addressingPDF 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_off00018b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B59 17776 bytes
SHA-256: 3976535e0788658c3db3db84e05d6cf48a04930bbb7cd048f43ca88bf7346b18
font_01_sfnt_off0001b9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1D7 10360 bytes
SHA-256: b4d0b31a3228c5c26debc25905e36c5e62834f49fe2c3fdd41f9640f72c5a434

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