Malicious PDF — malware analysis report

Static analysis result for SHA-256 1771d49228441476…

MALICIOUS

PDF

105.8 KB Created: 2021-07-06 15:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b8d4dffb8341ac23153ca9af507452e5 SHA-1: 297b9ca51bf70f02851c3580e22de1bb5c744830 SHA-256: 1771d49228441476f95c61cd2c4adb8c778faaa7d77619ac5802de082023f7a2
156 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 functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, but the presence of external URIs and link farm heuristics strongly suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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 https://irlanc.ru/uplcv?utm_term=meaning+of+repression+in+psychology PDF link annotation
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/meftfoopeims61do142o51veii/22514635233.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/fkrlga8ardh2ockq45g8lavmi4/kuxugimewogeto.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/2d02cc8e6ee128100d68224c56522a97/51699995299.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae201f3a228---sijowu.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5dcdc50ad4e6cd2719c0689c607a6ade/zubizanunotadoxerup.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/p587rpav55l4dvdpiu2js5lcon/kiril.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1db1702e2---6746289314.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/fusiku.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/waxetomuri.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/54843451.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/fizubedebilewetum.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/5qd4ijvfknrtdeg7kskej89kn8/79374639466.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6875890e1---lamufurudenizanudoronizuv.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f86bc959c---98437236555.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/4581eea1408cd06f1f46a68703806a52/pajudisix.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091c59d55e9e---kapibevesipagudidevufa.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855f0f2566e---vodoj.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b259a87f7f3---36196046107.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4qhhbp32u1nbp284e7e0c363f/11518947713.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/16226013961.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bff19b1a4---83640505553.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fa6099d5a---26118939517.pdfIn PDF document text
    • http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/45277291905.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210614044634_p7r9b1.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/mumovus.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/942d6ce342578065f5af58a39b34c3f1/fukesesuletud.pdfIn PDF document text
    • 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_off0001364a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364A 10768 bytes
SHA-256: eb34d35ecac7d3179436addc9e97adb766fec083fc44ad3c330f51769fdbfcfe
font_01_sfnt_off00014eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16711 19248 bytes
SHA-256: 9f6affc6398f75ae58e7e155343c5f28676d8d55c48b70bb11cfa3e3813682e0

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