Malicious PDF — malware analysis report

Static analysis result for SHA-256 662eba351517a80d…

MALICIOUS

PDF

108.6 KB Created: 2021-07-21 19:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3aeae506fc14ccd40742cb18035c74fb SHA-1: 0947fcfb26d116b4e63a35c117b1c1537babda16 SHA-256: 662eba351517a80d6208aa7ab81c001922e13f3c1ced23ce271ab277a1e3a9c0
156 Risk Score

Malware Insights

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

This PDF file was detected by ClamAV as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ajivikafinance.com/userfiles/file/nuzifub.pdf In PDF document text
    • https://gbagencement.fr/uploads/file/99163485728.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/zedizelawes.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///wokerirowubinubozuzu.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/bdec0978629eb0ef65d987d3852e382b/nogififokawikomaluwaw.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d587d634f0---nizafibuju.pdfIn PDF document text
    • http://mousike.it/img_ins/files/55645788881.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/r0do2khhg6vohbiskutf41p6e7/10839393972.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/70003410553.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/navebobuduwomefo.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52618241e39b0d7640fe83e15227657c/1275571370.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90142ada8f---47095362470.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/di8aje72bllekcoeoj1341696t/26983428277.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f6ff8e12d---47516403679.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607409b8b63b5---61705035401.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/25735799790.pdfIn PDF document text
    • https://avvocatoboretti.com/file/puxenememuvikogasafesa.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb67b0d83b---66643487802.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/femuwunuj.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/95613663384.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e26e89183---mutoraliferemir.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/4373760508.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5ebd707b075fc7a7facbb7cfde3502ff/3997119459.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/30543212811.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/7f85nr9k06nnkdhrccb2pfpssb/mitur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=clostridia+in+catsPDF 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_off000146b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B3 10260 bytes
SHA-256: 0ddb2cbd6e3ee701035d690433785d7e9129ae4b85a434792fd432ea5b054fed
font_01_sfnt_off00015de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000175f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175F5 17672 bytes
SHA-256: 15a8a3dd84cea19b720fab024f2cbec1527a6b89bb23548b42997f235a4194fa