Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41161b6729983e3…

MALICIOUS

PDF

70.9 KB Created: 2021-09-27 10:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3e3b8d9c8c21651ea34195b95bf00719 SHA-1: 8fdbb3be3f960309aced6b743eb7d1186a991b26 SHA-256: d41161b6729983e3bc0e64f4c94d29c562e97696977bc68a5fb0310f6b22158e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and other potentially malicious sites. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161470653d7e95---posolaborewowuzevax.pdf In PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/lomedu.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/41973044230.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/73879239479.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • http://psn-monolit.ru/img_file/files/vasatakikosowevabibi.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/8880204311.pdfIn PDF document text
    • http://bubb.cn/up_file/file/pedefusa.pdfIn PDF document text
    • https://dhesient.com/media/80928381103.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/buziweduzenop.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/15571688645.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/65164987940.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/lopuforevenenanilud.pdfIn PDF document text
    • http://scsytech.com/upload/files/17222874996.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/5pqlrfhflscsqkskif4sg6iolj/55934496825.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210906011937_76226855.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/dalogenowukipog.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb44a91751---petitujowidupelunedixowo.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/duderejene.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/39988005887.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/ladezerufukabevesovura.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/95435159349.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/gubipisesimaxobega.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/jewidikejixutetejanepese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ryona+games+for+androidPDF 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_off0000b1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F8 10712 bytes
SHA-256: 95ae86830b640c7f80d255bf8ac0621cc297679e45051177ad615e41cc24e125
font_01_sfnt_off0000ca5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5F 16560 bytes
SHA-256: 5c7827d7121038ae316251aa2ad0f7bd4cfc54dcf0e0f2bbc9b50662802e959d
font_02_sfnt_off0000f448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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