Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07deb4ebd5a7855…

MALICIOUS

PDF

77.5 KB Created: 2021-09-20 09:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c77cde04e529ab39c95cb198406178c SHA-1: ff1c248749ec033560ccd52f1650fc8720117d7c SHA-256: f07deb4ebd5a78554550826e1fa49d4c319379fc25b5f7ad6a8e1762fa73b12c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to host malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a secondary payload. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sor1310.com/userfiles/file/64269320423.pdf In PDF document text
    • https://people11people.com/uploads/File/88211966279.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/gikepibikoj.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/vovobatokafofunariwapur.pdfIn PDF document text
    • http://yongqingtech.com/d/files/2113233877.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210907141033.pdfIn PDF document text
    • http://evola.it/userfiles/files/33801476069.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/77714462733.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/wonalekosatavezegijomeke.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feab2084fa---74640808176.pdfIn PDF document text
    • http://sentralperdana.com/file/linidatukiridin.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/wowaronama.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/kubegil.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/287dac52ce7804abf23fba91dee1f7a5/woguvisep.pdfIn PDF document text
    • http://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/56150759817.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109192127011811.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ctoke3qd7qabhs3jdo7tc87t74/wanarafirim.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/detajirapu.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/mojojuxu.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/63727219496.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fc5e26dff---4088884395.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/zegevujobegobadinupavuf.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/54104467202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=restart+android+remotelyPDF 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_off0000c7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E7 19068 bytes
SHA-256: 1acc9237b65e391d4ce6c0e36e96826fbd50fdd185aa47e3672e76a3ede661f7
font_01_sfnt_off0000f8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BD 10568 bytes
SHA-256: c0cb7551530c01586c2d8579d29d875f5e8e5a3e455bb8465f487e7c53d536bd

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