Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1abd0a0ba410f0…

MALICIOUS

PDF

75.5 KB Created: 2021-07-10 13:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c7dca10e3575d65d5895aeda762cb51e SHA-1: 3989188e43001f77759f2ba82026f89b3b01f6e4 SHA-256: 5d1abd0a0ba410f07b06620c598ff8e02ead0b3802466be4571baeeb00d6d152
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document provides instructions for accessing such an archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160952afbc5dda---golavusozonujinadudi.pdf In PDF document text
    • http://norilskgu.ru/userfiles/file/24393984749.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075387a8981e---pipunadolimuxajijamoxowir.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/kisojezakedaxo.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0bfd948b3---97795984521.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/talelo.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/55455757109.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/bogatedubej.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084448eb751b---33220204789.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nipoleretasew.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/ec1f03d2735879bc247e0cb52bd9050b/43276062001.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607cacc923923---45416446765.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/id5mvc97in6smvuv6luckgnqu4/fabixalejonorowusutobidot.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/difubovobuvig.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fabinotus.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/44895043428.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/298a5729d6643437df12f24734ddc854/zorejawu.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/3977fb59a2833bf57fe0dff207a4dc6c/83843519040.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/gutimamulukimozowim.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/bakojogi.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1caf5614a---mavaxuripu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=oxford+grammar+for+eap+english+grammar+and+practice+for+academic+purposes+with+answers+pdfPDF 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_off0000c3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE7 15976 bytes
SHA-256: 4a7c1f6ea789b2c7f1a3d21098d61a66d155f8a7964475aa5f17a2094068c618
font_02_sfnt_off00010536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10536 11380 bytes
SHA-256: 279add0c77ea198e72bc6d0876c2fa52c0fcbbf4d03f9b5c5dac74a5c6cd5226

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