Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6433706b055b48…

MALICIOUS

PDF

84.1 KB Created: 2021-09-12 05:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6b79c2d7610778128585c1a0313b373e SHA-1: 9c9ba28f3c77e4691705fbc2f5f49be53ecf8340 SHA-256: ef6433706b055b48d7e273890e328045907ab25ec0f3890856c6b2e01318f5e7
156 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. The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://eluvial.com/sites/all/sites/eluvial.com/files/85587330213.pdf In PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/jeripijitifekutamolemifeb.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210911092449.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/zijelilifabuwufugejusu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613645f90262a---zujepiremakugugufosiveg.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/24113449155.pdfIn PDF document text
    • http://haai.org/upload/file/80595898986.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319a6ecf96d---58103353262.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/42340808001.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/41417a9bd15bb5690ed9c65c2289daaa/99285593652.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/tinevivamuwafufo.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/mixotaselurofemolevojan.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109111854114098.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133f3e480ab1---63859172804.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcdf50b663---dewetuzejo.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/34280136325.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021090314570773499.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/59992990552.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/wosozodekamiref.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/vpp45d4t1m9eiesdi806s6b30s/serisojenoremawuxovus.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/18676454223.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/vefifixepozadazesafosez.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/23156378860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+i+hide+my+number+on+androidPDF 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_off0000dfbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBC 19472 bytes
SHA-256: 896f5a709446d6062625f3eab7c4bf227b6145edf46d933077d367af7dd2a54b
font_01_sfnt_off000112b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACD 10632 bytes
SHA-256: ec796f6e90fc0e336da24f7674cc626b41f3e7f1c082913e14b5102a1dd2b25d

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