Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2c6539b558f163…

MALICIOUS

PDF

72.1 KB Created: 2021-05-04 09:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1a91fe38f20b5ef5cdd332603ca557e SHA-1: 925ea728b7ea5ffcad4de4c90cb32310c9884c3f SHA-256: 4e2c6539b558f163b4afc67ac81eb40c3e49f612e3efb93c898ba6a9f63704bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to compromised websites, suggesting it functions as a link farm to redirect users to malicious content, possibly disguised as a school attendance application. No scripts were extracted, but the PDF structure and embedded links strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/mjno0vdt90rvace73tpsk7qdcq/4560120541.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/7teo8574si659o1epbphvpi5tl/sirotanajexow.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/fad5703b76f226cd2b8e72fc412fd55f/zefilotetomipaberirivodoj.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/115f33f16ce39ccc6ffc276baddf8e40/83790080353.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/f794197677e13dff59dac30a95488414/89061136785.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/2olar5t61ufkhefgo774jp02l4/30557799516.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/74ee7722f99b164314aa1d6dad872749/19365265779.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/825e2db67fe765b1d5ea7f41d6fb0dc3/36251274075.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/8f5662rg87jdjdat6dvdeb4fpd/wixozobixedizisimojap.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab256f95c---15573252243.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c79e5f393---nesejupudetonudiposewelo.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf7a7afab9---2981909181.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f50fb4dd58---43737625752.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870d1aee170---sasikasojemepodixipuvil.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160862e58ae2ac---pukidarimo.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0ff5a02b6---78476311812.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=emis+tn+school+attendance+app
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2e0.bin
0e5bfe7d36113b43a76c6bc7ce70e34fb7e73b39d9345dbc45f70c5935131ca8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E0 4964 bytes
font_01_sfnt_off0000e387.bin
576e724f1ca7a23453c73b33535fa18a633e6bec08a24496b4099d04fc4dfea5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 9972 bytes
font_02_sfnt_off00010598.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 4324 bytes