Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3853bc39f8317ac…

MALICIOUS

PDF

97.6 KB Created: 2021-07-30 11:33:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a293c33ad8cdd42fa0737073fe4aad00 SHA-1: 3b852e93df20524bb52f1e9e133f182d7ad9ddfd SHA-256: a3853bc39f8317ac212b5a09768dfa44b5ab77f955d8f0e59aa35c1e588f31c4
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDF files hosted on compromised WordPress sites, suggesting a link farm designed to distribute malware or lead to phishing pages. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 7

  • 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.
  • 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 https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a45feb06ab4---84747928382.pdf In PDF document text
    • http://grupopiscis.com/upload/files/64566728527.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dixividavotugo.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/vuzexivexinu.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/363a02cc13c72dd74becc854959d9eaf/53341644228.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/42e5b245ef4620bc6e9b74b10f280e1f/tutuxitijuk.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/827cd5026e2ea1058e370ce841dc7da3/nagivatitasixosafe.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/virevebatibefukifafe.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2d0506114---20810597785.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609112a2afac4---nejoxelenunul.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e451d598c2bdffa042b9f639c12be39c/17107165276.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/58494611055.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/vexitejizogeputamil.pdfIn PDF document text
    • http://mvhs78.com/clients/68382/File/vazijatomotakoruxafobe.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/latixubitexavodon.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/9640949237.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/e00fb14d63100952bde7787b18521816/98937476346.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/57c6aad354991daa5fc36ecb0677fcfd/78903329563.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/jjks8imn4gk54e0766raijkk20/wupewuwutoj.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/vifenag.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/96977167279.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/27755073597.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/93d30b39f03654e2f652903023254514/11565289896.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c18bc277a---xepobujate.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac2b661c23---xutog.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/73374178492.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/97577362064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+hack+axes+in+lumber+tycoon+2PDF 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_off000113d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D7 19228 bytes
SHA-256: 07166d95fb829bca9da6942716576ca7dab4e4330478f34acb0ebec1bcbf3fde
font_01_sfnt_off0001451b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1451B 11240 bytes
SHA-256: 7078575dd2ae0dcf349d387e5ca299b50cf4343954915beb7f6c1eaaa8ab9ec5
font_02_sfnt_off00015f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.