Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e4dd523529e0ea…

MALICIOUS

PDF

86.7 KB Created: 2021-07-03 13:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39388cb7c20586675734169d6e0b035e SHA-1: be952debd62ac4b657fcccad4c7231ceb428d8e1 SHA-256: 87e4dd523529e0ea798da4ccbd8224997dedeac37c6950118f1779c10a33c470
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6dae6c905---62730029555.pdf
    • http://ahxxzx.com/userfiles/202105/file/40759991272.pdf
    • http://niengrangchuyensau.com/upload/contentFile/file/nogevugaroveti.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5210f08db---19568070321.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/3b406ad6035e0b2e75cce096c3f2933c/kanelevolo.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcde65ba79---30502408361.pdf
    • http://cablexconsulting.com/Upload/file/60207554448.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d91363f9dc---kejawixujap.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b52012d74---14479821050.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/13a85e3b52e1a373a6dbb43b6b2dec57/nuwuze.pdf
    • https://cplastik.cz/data/cms/file/82544715886.pdf
    • https://tonitomov.com/picture/file/salodoxekatabipa.pdf
    • http://zaun-produzent.de/userfiles/file/lodogikanawi.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/81857270656.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607775f51456e---99871198740.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609022342a696---kitiwoxugenokofilig.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd8cadbc54---zilapomu.pdf
    • http://greece-ex.com/images/blog//file/gixeder.pdf
    • http://builderall.info/userfiles/file/rujagexotukuxeriw.pdf
    • http://divorce-difficile.fr/userfiles/file/wonabugegaxefuzunodapow.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed5ce99e53---wefiwagejidor.pdf
    • http://murito.fr/ckfinder/userfiles/files/6937567157.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/17ebdf5e46ecbc44467d7bac9b2c598b/2615707.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=stomach+cramps+cause
    • 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_off0000f085.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 16792 bytes
font_01_sfnt_off00010897.bin
6da87b7c0e2f28126fef26da7ff2aee945a88c559dea27e09627d72933bca6b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 17316 bytes
font_02_sfnt_off0001358c.bin
b3b0f202c2e544cec02d57b4b74c14c53d6caa2c69be4b7eb4dd38a026dc8d1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1358C 10572 bytes