Malicious PDF — malware analysis report

Static analysis result for SHA-256 f193af6e83ac13a8…

MALICIOUS

PDF

112.2 KB Created: 2021-08-10 02:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6cfe9340278a3523df59f94eab7f5de0 SHA-1: 0e406d16df356053373b330a674dea1087a140fb SHA-256: f193af6e83ac13a8c41a462f583320412f46a5b4417f488a352f0224fda39052
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic to drive traffic to specific content. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cructi.ru/uplcv?utm_term=home+alone+disney+plus+4k PDF link annotation
    • https://ambient-interier.cz/files/files/faxatizozinefolibe.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8e6e5ed17---wutilume.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/63276169623.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/sefoviserimobut.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/55325790946.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/d83a805156393922e498da9215847460/tefukutiwov.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/51039969980.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/80518945902.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e90b259fa---42216266743.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/66852152020.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/9be88a6ad3f4df7ca3deb402bd17f9ed/9174795488.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/pikejarafunedif.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4751fc11fe---dokutonulavekuziwir.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/kuwalexivevafomobed.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/degutuxomogarir.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa365cec755---36606033926.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb47227ffb---denuvironorofexa.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/a6f5978fba7df09ee2d9888e1c19c7fc/28677943848.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/tikenanaj.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c71f7832cfa---dixekopupoxebaweroxi.pdfIn PDF document text
    • https://tepihtrava.rs//files/72307521270.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/wasegodidufitinudivegab.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/9lmvtkieb737smnlosn3fp9v33/jujajobigaduzov.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/e37gn1psfh2bveovu9qe4n9tv1/xisimo.pdfIn PDF document text
    • 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_off00014ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE5 19776 bytes
SHA-256: cdfde8e78b8042f925c85b7e2080f2a067d70be9c45108fa5a053cc4d406e2c5
font_01_sfnt_off000180dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000198f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198F3 10728 bytes
SHA-256: c9e621bc0353c83d0ee40f139cf03cea4a04eb6e1a9681d3477bc53eb25f6d67

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