Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42a1589edf223e8…

MALICIOUS

PDF

74.0 KB Created: 2021-07-04 08:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0cdbb3b00bb9645397cc73d583e0274 SHA-1: dd471eda95bb20ca36dd9e86d97409636b72e420 SHA-256: e42a1589edf223e8b3deb6e57b5d2885859d8a8d05fc57f73bdc0bce4c288926
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable or compromised hosting suggests a tactic to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=they+may+vary
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/2c509754c9f60d542c87992c1e63dbe7/62178847755.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c325e957ec---kevuxo.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/0632aaeebe730c1e252937a189fd4050/62162959604.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/5ea29ed241200c176038f736d2ab2be9/tenilewogosof.pdf
    • http://cuatro-pr.org/sites/default/files/file/jurenuke.pdf
    • http://poorclarescork.ie/images/vagexisudowi.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078fa775ba30---44508335766.pdf
    • https://olivier-daulte.com/ckfinder/userfiles/files/kubepefixa.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/efb14aa3c35db6bb6c775ce5a15878a2/32293322436.pdf
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/8dd7f802c458a6fef060d1766f985aeb/66158518505.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d60abf92f---71754720523.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3b1b90cb57275a6aa92485fd9912c815/26710332030.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/fd2ecbe0cc555fa7ce2a24aeeb3dfc7c/napolitoro.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4852bf1057---zekapitakujusonib.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa89759bbfb---17937552854.pdf
    • https://hospvetcentral.pt/site/upload/file/94779272991.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f6eec0490---17943523374.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78906147e---72238395275.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af9c2a4148---36814595840.pdf
    • http://agendatourvietnam.com/hinhanh/file/mezefaxufuleg.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e60ba23a5---739903230.pdf
    • http://textingrights.com/userfiles/files/58478674843.pdf
    • https://bonekarusa.com/contents//files/xitoletopezapiwururinusi.pdf
    • https://istocdukkan.com/userfiles/files/91619151811.pdf
    • http://www.allatpatikapecs.hu/images/file/73840705852.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DE 16792 bytes
font_01_sfnt_off0000d8f4.bin
bc79d42c2fd6905ae07328db04ac2f959575782642e0734a263a6de92b716ebc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F4 9888 bytes
font_02_sfnt_off0000eeb8.bin
dc0e23c951c1c3212c91875885df48433ebe3ceccfe6fc9536f6e884807f81c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 17264 bytes