Malicious PDF — malware analysis report

Static analysis result for SHA-256 556d4b5e337a04d5…

MALICIOUS

PDF

90.7 KB Created: 2021-08-20 23:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2c5da3c3ba9d1a76b02fb3333437d0c7 SHA-1: 9cb2fda4740488c5611286273ee1d3bb80518fac SHA-256: 556d4b5e337a04d5bcc4743316b5278929527bc6430622fce86947abd20fcd79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.alcera.ca/userfiles/file/582198953.pdf In PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/mavijatasomanixigixejexav.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/fcs8jpg4b59sai3smadbt6da3f/77384517150.pdfIn PDF document text
    • http://unsersohn.ch/images/file/99982175167.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/5943920535.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb0078613---simoxojejefedevomadaboson.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/guzisaguzipuneruxosati.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/47193806021.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/82982380922.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8b5f9c2fceb520eddea48374b742ccc6/xupivukaruxekoto.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d1605730083c25459b9655c0c9b11a7/rulazipobiguwikomogak.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/143852823360d3f74a8ee23.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/zajam.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160abe44b673a4---zonijifolasozibaz.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021061520312473499.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/jepakazaripo.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a5e97cb9a---31117263228.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeb16ca4d5---dumotifile.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/18697739866.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/fitetetepidakar.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/28282860812.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ab95392cf034ac3aaf8ca160f4192421/rokorobukeba.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/k0v56htdc33njsafk42t8g5mr6/pabukodatasamexegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+is+vision+ias+mains+365PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78D 17056 bytes
SHA-256: 4e3ac74c2f9b1e76a86f0a74dd74ad606bdb600124a6e7bc2ea2b1c75d905ebe
font_01_sfnt_off0001141f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141F 16340 bytes
SHA-256: 88a5f3ad9079b2340172ecd64f1cd79ba1ad1753eb2b73e58de10c5a7be67d15
font_02_sfnt_off00012a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A17 10628 bytes
SHA-256: e565a68dc02edcf5f911d3a2322d9bff124604d62a1b3f236dc88d8a2b806651
font_03_sfnt_off00014252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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