Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f9052a7093387c…

MALICIOUS

PDF

96.7 KB Created: 2021-09-13 17:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fc5a65370082795987abec8c9f75743 SHA-1: 00feb891bbb09d4290049c5a2faf77ed9bec6ef0 SHA-256: b9f9052a7093387cc3397ba0c726f04326c6f43a8688d485cce54e69efd66377
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of external URIs with terms like 'login 365 office login' indicates a potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5514eff4310369c4f4888f02a6961ef8/kisatijevuzobojo.pdf
    • https://portalbime.com/UploadedFiles/New/file/bemeniveruwukukok.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/i46h9mdn5bttnunv7i694ct63b/misazixixizalug.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1612edfb06ea59---24282883060.pdf
    • https://skinrepublic.vn/webroot/img/files/425444329.pdf
    • http://skkl.cn/filespath/files/20210902055546.pdf
    • http://charmingcurls.se/upload/file/79853482480.pdf
    • http://rafaelokazakov.com/file/45854617230.pdf
    • http://pensjonatagat.pl/userfiles/file/49613386052.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132551bac085---15289429386.pdf
    • http://svenskafik.se/uploads/fckeditor/file/tasivibenofazejukujinini.pdf
    • https://atrax.hr/files/59049442964.pdf
    • http://opusincertum.it/userfiles/files/90005408379.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/lapixatozasijifawem.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ce8390eb0fc2de8d82832db9d4883b2f/63979992998.pdf
    • http://goldenagegroup.vip/userfiles/file/kosawejatixadedajorizud.pdf
    • https://lanhcongnghiepthinhphat.com/upload/files/40630906226.pdf
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/49258252231.pdf
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/89352669868.pdf
    • http://dierenwinkelindex.nl/images/uploads/nifawolejasegive.pdf
    • http://schokoladenfontaene.de/idata/besirukewijok.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/75283318882.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/69dac69779861e273c6481357a737e5a/89454799810.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/zoxowajadogukebukewete.pdf
    • http://rafaelokazakov.c
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=login+365+office+login
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e24e.bin
682d8efbc6a0e23fe1c8d55b0a6ed6519aa9e9c7155bee81ae87281be198329b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE24E 25704 bytes
font_01_sfnt_off00012385.bin
f6e284136e8e0fb5b0f7d359131c4d84ec28df79e1ab6fc67c5286eb9281b494		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12385 2084 bytes
font_02_sfnt_off00012d03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D03 16792 bytes
font_03_sfnt_off0001451a.bin
8a33101fa5bf6d3b408b95d7175f3906e6d700861ad066060268c8afb15d3277		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1451A 10416 bytes
font_04_sfnt_off00015ccc.bin
5210a1a77c41d9026debf72e0931d14ce44214bee9824800e1893842d51a07f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CCC 16500 bytes

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