Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1e3c6f447c467e…

MALICIOUS

PDF

89.2 KB Created: 2021-07-04 23:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 20b6c51810e531d53a02e3e3f498822d SHA-1: caec232e2e8675a765880b423a9ab4be20925b61 SHA-256: 1a1e3c6f447c467e582ed8637ccd7b78a427cf16c11185a90f1e6ace45ac67e3
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a coordinated effort for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/6991037743.pdf In PDF document text
    • http://rubensova16.cz/files/file/38175232129.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/55530403492.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/dosisesutedezoguketin.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/42117454720.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/kalb58i5nvvkb79k2n5qgokav0/74722022720.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/k6i2tr5ld8sqvkr4beemf4nja3/14399056218.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/51164957528.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccc75a4930---33856227736.pdfIn PDF document text
    • http://elitvorota.ru/f/file/26919677269.pdfIn PDF document text
    • https://noddy.nu/images/file/2782823679.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/damojufiwiluxu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3573b9c51---vofopota.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/27444902030.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba873cf26---kokimanusozirazap.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/19333894918.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/vutepiwalikojizobudar.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/vituragaxabomazux.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/08fbed5c44869bb35c79a260a89d1640/35244809416.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/bubototexeveduvelojaf.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdf648ae85---50923916092.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/wojefaruz.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5b4d5cc49---xeseraperexijajenimofevi.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faa3b465e1---zalel.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/eb53fe1ac8d668be98fbf24acf3c84cc/17600193287.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d99b5127ba5---wabefojazagitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=law+and+order+introPDF 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_off0000fb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 10072 bytes
SHA-256: 131ce9faf0a46518b53e50ded2b6f4ee0a3e9c10840d8af6dfdc121837587ed2
font_01_sfnt_off0001119f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B1 17996 bytes
SHA-256: 65b312e71fa052879f1f19df642a3bfb323d6b17c7712d9bd5bd18f42fa20fcf

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