Malicious PDF — malware analysis report

Static analysis result for SHA-256 055c7d0c76ec8405…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 19:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce8469b6c2bbc7d9af5265fd682d60a5 SHA-1: 21f9dd76dd53615bb2b9904eb081f4b862098767 SHA-256: 055c7d0c76ec8405d2bcd8001f2000bbf0b357c52b384ffb8954fc380ed851c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to numerous compromised or disposable hosting sites. The presence of multiple external URIs and link farm indicators suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crewmak.ru/uplcv?utm_term=in+jesus+name+lyrics+pdf PDF link annotation
    • http://ggmtc.net/userfiles/files/31143927827.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/a37d29355a3f27be7effe02cd1281729/52599039326.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28c50bf0a1---nadevumujola.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/duwuvukosomuwofexuxofopov.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/mqdk1mledfddg9iq8v4n6rmea4/27134554359.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/bemamefisefexubadasaf.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/vakezuselojinofokepitad.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/89610962910.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff938641dd---97113713338.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/fae3d0d0963b255243ecafc271a9d93c/kupobajefod.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a118141c7---98197100137.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210901231306_wmyn2c.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/jujegaripo.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/batejitukurabitulemabij.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1be2d7f74---nirojiwotowudokovarug.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/12438968583.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/topulaweradejij.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/211157499714.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/2968462838.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085e64c7b133---60702031091.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125d62b18a8e---xuxobim.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/62699275072.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dafd5725e---zigepozotaparuje.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/22bf998eb2cc2169f5f10a63e8a4dcef/11608526794.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/1857543554.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/98600927966.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_off0000dce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 10860 bytes
SHA-256: 5eeb961d5eef701be76ed8a4de4e5bd6cec0de38701bfeac68d14d00bade980f
font_02_sfnt_off00010dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 18268 bytes
SHA-256: 1d6e9b6bcbd1ba09735df089d16ad5851fa215f529ba2aa4030ce81d504e9405

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