Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c1151610f7fe31…

MALICIOUS

PDF

78.4 KB Created: 2021-09-01 20:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3dedcde2ff27cf464379f0cfda7e322c SHA-1: ad908a0f27ca2157bf28413ecb5d1c3e7fb28853 SHA-256: 84c1151610f7fe3118025333d1ff09d79033db6f3d5463f79eeb2317a5990a7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d956a97df---vebazufixoralaminowe.pdf In PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/xomoluv.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/886b98aaa3809b095820646aafe9b658/39243544459.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/nulefudekuwefo.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/dopipedimiwititulu.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/41838024860.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3529ac1f7---65171196405.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/gezulonakez.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/selonomiwujipag.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710c8a71588---zuwuw.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/23002333901.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/80491439061.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jn53tu0vlpp05sijq9bnjisi8s/44165169632.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/52300404002.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b7e7db61d---27741408800.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/3993277428.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/712defd67cce71c221b2cab16aa34989/7801209858.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/blsbqativ238fh0kvfi0mea3rc/sojufavonomakikas.pdfIn PDF document text
    • http://scan3dsaigon.com/upload/files/najuradesibesori.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/bifoj.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/8jatq2mag5e51htsretp95mvp7/27231303351.pdfIn PDF document text
    • http://farmina.ru/uploads/files/44268326167.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ho1dhq1puk95scrrac2m3nhvqd/jetopa.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/98746185559.pdfIn PDF document text
    • https://breedlife.com/upload/files/radiburejidaxiwazetiro.pdfIn PDF document text
    • https://dukupahit.com/contents/files/vazuwam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cars+beginning+with+jPDF 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_off0000cf43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF43 10608 bytes
SHA-256: f2a48bfdf2856a3dd184e0a2dc1ad072d26ec73bb15833beee0e326004d36b2f
font_01_sfnt_off0000e77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 17140 bytes
SHA-256: 8077acd9e8d26cacbc7d1f7e7b32a09a4c667af2fc7341d15dfcf9a55c652ac9
font_02_sfnt_off000113c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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